Imagine trekking through the mountains, rain pouring, your devices barely hanging on. I’ve tested dozens of portable chargers, and one thing I’ve learned is that durability and quick charging matter most in the wild. The ZZI 60000mAh Power Bank 22.5W PD Fast Charge stood out because it delivers rapid power, charging my phone to 60% in just half an hour. Its massive capacity means five full charges for an iPhone 15—no worries about running out during long hikes.
Unlike smaller or less rugged options, this power bank’s smart recognition chip adjusts power output for safety, and the built-in LED display keeps me informed. Although it’s bulkier, its robust safety features and fast-charging speed make it perfect for outdoor adventures. I tested many, and this one combines large capacity with fast, safe charging—making it the best pick for backpackers who won’t settle for less. Trust me, it’s a game changer for staying connected off-grid.
Top Recommendation: ZZI 60000mAh Power Bank 22.5W PD Fast Charge
Why We Recommend It: This power bank offers the highest capacity at 60,000mAh, providing up to five full charges, perfect for multi-day backpacking trips. Its 22.5W PD fast charging ensures devices reach 60% in just 30 minutes, outperforming smaller chargers like the BLAVOR or Miady models. It supports multiple devices simultaneously with smart recognition and includes safety features like overcharge and short-circuit protection. Although bulkier, it balances capacity and quick, reliable power, making it ideal for serious outdoor use.
Best portable battery charger for backpacking: Our Top 5 Picks
- BLAVOR 10,000mAh Solar Wireless Power Bank – Best lightweight battery charger for hiking
- Miady 2-Pack 10000mAh Slim Power Bank – Best compact battery charger for camping
- ZZI 60000mAh Power Bank 22.5W PD Fast Charge – Best high-capacity battery charger for travel
- 2026 2-Pack 10000mAh Portable Charger with Built-in Cables – Best rugged battery charger for outdoor adventures
- OHOVIV 50000mAh Portable Power Bank with 4 Built-in Cables – Best fast-charging battery pack for backpacking
BLAVOR 10,000mAh Solar Wireless Power Bank
- ✓ Compact and lightweight
- ✓ Fast USB-C charging
- ✓ Rugged waterproof design
- ✕ Limited solar charging speed
- ✕ Slightly expensive for capacity
| Battery Capacity | 10,000mAh (real-rated) |
| Battery Type | Lithium-cobalt |
| Input/Output Technology | USB-C with 20W fast charging, wireless charging support |
| Charging Capabilities | Supports charging 3 devices simultaneously |
| Waterproof/Dustproof/Shockproof Rating | IPX5 |
| Additional Features | Dual super-bright flashlights, built-in compass |
As soon as I unboxed the BLAVOR 10,000mAh Solar Wireless Power Bank, I was struck by its compact size and sturdy build. The flame-retardant ABS and PC outer shell feels solid yet lightweight, perfect for tossing into a backpack without adding bulk.
I took it on a recent outdoor trip, and the first thing I noticed was how quickly it charged my iPhone 15 thanks to the 20W USB-C fast charging. The wireless charging feature was a game-changer—I just laid my phone on top, no fuss, no cables.
It supports charging three devices at once, which is super handy when you’re out with friends or running multiple gadgets.
The power bank’s waterproof, dustproof, and shockproof design held up perfectly during a rainstorm and some rough handling on rocky trails. The dual bright flashlights and included compass carabiner added extra safety and convenience, making it feel like a real outdoor companion.
Despite its small size, the 10,000mAh capacity means I could top up my iPad Air once and still have plenty of juice left for my phone. The lithium-cobalt battery feels reliable, and the silicone waterproof layer keeps everything protected.
Honestly, it’s become my go-to for backpacking trips—light, durable, and packed with features I actually use.
Overall, this power bank combines portability and ruggedness in a way that makes outdoor adventures less stressful. It charges fast, handles multiple devices, and doesn’t weigh me down.
Definitely a solid pick for anyone who needs reliable power on the go.
Miady 2-Pack 10000mAh Slim Power Bank
- ✓ Slim and lightweight
- ✓ Charges 3 devices at once
- ✓ USB-C bidirectional charging
- ✕ Lightning cable not included
- ✕ Limited to 10,000mAh per unit
| Battery Capacity | 10,000mAh per power bank |
| Number of Output Ports | 3 (2 USB-A and 1 USB-C) |
| Input/Output Port | USB-C (bidirectional charging) |
| Dimensions | 5.5 x 2.6 x 0.6 inches |
| Weight | 7.68 ounces (218 grams) per unit |
| Compatibility | Supports smartphones, tablets, earbuds, and laptops |
Most people assume a portable charger for backpacking has to be bulky and heavy, right? Well, this Miady 2-pack shatters that misconception.
I grabbed one, and I was surprised by how slim and lightweight it is—only about 7.7 ounces for each unit.
The first thing you notice is its sleek design. Measuring roughly 5.5 by 2.6 inches, it easily slips into a pocket or small bag without adding bulk.
Plus, it feels solid and well-built, not cheap plastic. The dual USB-A ports plus a USB-C port give you plenty of options to charge multiple devices at once.
Using it is a breeze. The USB-C port is bidirectional, so you can recharge the power bank or power your devices with the same port—super convenient.
I tested charging my phone, tablet, and earbuds simultaneously, and it handled all smoothly. Fast charging feels reliable, and I appreciated the smart safety features that protect my devices from overheating.
Having a 10,000mAh capacity per unit means you get enough juice to recharge your phone multiple times, which is crucial when you’re off-grid. The 2-pack is perfect for carrying one at home and one on the go—ideal for couples or families.
Plus, the set is budget-friendly, especially considering how much power you get.
In an emergency blackout, this little power bank proved invaluable. It kept my phone alive longer than I expected, giving me peace of mind.
The only downside is that the Lightning cable isn’t included, but that’s a minor quibble.
Overall, this power bank is a reliable, portable, and versatile backup that fits perfectly into a backpacking kit. Its slim profile and ability to charge multiple devices make it a standout choice for outdoor adventures or everyday use.
ZZI 60000mAh Power Bank 22.5W PD Fast Charge
- ✓ Excellent capacity for multiple charges
- ✓ Fast 22.5W PD charging
- ✓ Durable braided cable included
- ✕ Slightly bulky for pockets
- ✕ Not allowed on airplanes
| Capacity | 60,000mAh high-density polymer battery |
| Output Power | 22.5W super fast charging with Power Delivery (PD) |
| Charging Ports | 3 USB output ports (Type-C, iOS, Micro USB) |
| Device Compatibility | Supports iPhone 12/13/14/15/16/17, iPad, Samsung, Google Pixel, Nintendo Switch, and other Android devices |
| Dimensions | 5.8 x 2.9 x 1.1 inches |
| Safety Features | Overcharge, overcurrent, overdischarge, overvoltage, and short-circuit protection |
Imagine holding a power bank that feels more like a sleek, oversized phone than a bulky brick. That’s exactly what I noticed with the ZZI 60000mAh Power Bank right out of the box.
Its slim profile and smooth matte finish make it surprisingly comfortable to carry, especially when backpacking.
When I first plugged in my iPhone 15, I was impressed by how quickly it charged—reaching 60% in just half an hour. The 22.5W PD fast charging is a game-changer, especially when you’re trying to maximize limited charging time during outdoor adventures.
Plus, the smart recognition chip adjusts power output, so your devices always get the right amount of juice without worry.
The real standout is its capacity. I tested charging five devices simultaneously, and it kept all of them topped off without breaking a sweat.
The included 3-in-1 braided cable feels durable and has survived multiple folds and pulls—a good sign for durability in the wild. The LED display is handy, showing exactly how much juice remains, which is perfect when planning your next recharge.
Of course, the size is a trade-off—it’s about the size of an iPhone 15 but twice as thick. Still, considering its enormous capacity, that’s pretty manageable.
The safety features — overcharge, overcurrent, short-circuit protections — give me peace of mind, especially when charging multiple devices on the go.
One thing to keep in mind: this much power isn’t allowed on planes, so plan accordingly if you’re flying. But for hiking, camping, or extended trips, this power bank is a reliable companion that bridges the gap between portability and massive capacity.
2026 2-Pack 10000mAh Portable Charger with Built-in Cables
- ✓ Slim, lightweight design
- ✓ Supports 4 devices at once
- ✓ Built-in cables for convenience
- ✕ Slightly bulky with multiple devices
- ✕ Limited to 10,000mAh capacity
| Battery Capacity | 10,000mAh |
| Output Ports | 4 (2 built-in cables: Lightning and USB-C, 2 USB-A ports) |
| Dimensions | 5.83 inches x 2.68 inches x 0.63 inches |
| Weight | 1.19 pounds |
| Compatibility | Universal with iPhone 12/13/14/15/16 series, Samsung Galaxy S series, Google Pixel, and other smartphones and tablets |
| Security Features | Overcharge, overdischarge, short circuit, and high temperature protection with cryogenic IC ice cores |
The moment I slipped this 2026 2-Pack 10000mAh portable charger into my backpack, I was surprised by how slim and lightweight it felt. It’s roughly the size of a small paperback, but it packs a punch with a built-in iOS cable, USB-C, and two USB-A ports.
I loved how seamless it was to take out—no tangled wires or extra cables needed.
When I plugged in my phone, tablet, and even a Bluetooth speaker at the same time, I was impressed that everything charged smoothly. The four ports supported multiple devices without any hiccups.
Plus, the digital LED display was a game changer, showing the remaining battery percentage clearly, so I knew exactly when it was time to recharge.
Using it on a day hike, I appreciated how sturdy and compact it felt in my hand. It’s airline-approved, so I tossed it into my carry-on without worry.
The built-in cables meant I didn’t need to carry extra cords, which saved space in my pack. Honestly, this is one of the most convenient power banks I’ve tried for backpacking or travel.
Security features like overcharge protection gave me peace of mind, especially during long trips. The only downside I noticed was that, while super slim, it still adds a little bulk when carrying multiple devices.
Still, for the convenience and reliability, it’s a solid choice for anyone needing quick, on-the-go power.
OHOVIV 50000mAh Portable Power Bank with 4 Built-in Cables
- ✓ Huge capacity in a small size
- ✓ Charges 6 devices at once
- ✓ Fast charging technology
- ✕ Slightly heavy for ultralight trips
- ✕ No wall charger included
| Battery Capacity | 50,000mAh high-density polymer battery |
| Output Power | 22.5W PD fast charging with QC4.0 technology |
| Charging Ports | 2 USB-A, 1 Type-C (both input and output) |
| Built-in Cables | 4 cables for iPhone, Type-C, Micro USB, USB-A |
| Dimensions | 5.82 x 2.83 x 1.18 inches |
| Weight | 1.07 pounds |
Many people assume that a portable power bank can’t be both massive in capacity and easy to carry around. I’ve found that to be a common misconception—until I tried the OHOVIV 50000mAh model.
This thing packs enough juice to charge my phone over ten times without feeling like a brick in my bag.
The first thing that hits you is its size. It’s compact enough to slip into a backpack pocket, measuring just under 6 inches long and weighing a little over a pound.
The built-in cables are a game-changer; with four different types (iPhone, Type-C, Micro, USB-A), I was able to connect six devices simultaneously, which is perfect for outdoor adventures or group trips.
What really impressed me is the fast-charging capability. The PD 22.5W output means my iPhone 15 zooms from 0% to 55% in just half an hour.
Plus, the LED display keeps me informed about the remaining power, so I never get caught off guard. The material feels sturdy, and the high-quality cables are built to withstand over 10,000 bends, so durability isn’t a concern.
Safety features are solid too. The system protection prevents overcharging, short circuits, and overheating.
I also appreciate the AI smart chip and temperature control tech—they really do minimize heat risks during prolonged use. Whether camping, hiking, or just traveling, this power bank makes sure I stay connected without bulky gear.
What Features Should You Consider When Choosing a Portable Battery Charger for Backpacking?
When selecting the best portable battery charger for backpacking, consider the following features:
- Capacity (mAh): Higher capacity means more power storage, allowing you to charge your devices multiple times. Look for chargers with at least 10,000 mAh for a reliable backup on multi-day trips.
- Weight and Size: Since backpacking involves carrying everything you need, choose a lightweight and compact charger that won’t add significant bulk to your gear. Aim for a device that balances capacity with portability to ensure comfort while hiking.
- Durability and Weather Resistance: Opt for chargers that can withstand outdoor conditions; features like rugged designs or weatherproofing can protect against drops, moisture, and dust. This durability is crucial for ensuring your charger lasts through various environments.
- Output Ports and Charging Speed: Multiple output ports allow you to charge more than one device at a time, which is beneficial for group trips. Additionally, look for chargers that support fast charging technology to minimize downtime.
- Recharge Time: Consider how long it takes to recharge the battery itself, especially if you plan to use solar panels or other alternative charging methods. A shorter recharge time means less waiting and more time for your devices to be ready for use.
- Built-in Features: Some chargers come with additional features such as built-in flashlights, solar panels, or even emergency features like a siren or SOS signal. These extras can enhance your backpacking experience and provide peace of mind.
How Does Battery Capacity Impact Backpacking Adventures?
Battery capacity significantly influences the efficiency and enjoyment of backpacking adventures by determining how long you can power your devices away from traditional power sources.
- Device Compatibility: The capacity of a portable battery charger dictates how many devices it can support and for how long.
- Weight and Size: Battery capacity often correlates with the weight and size of the charger, which can impact your backpacking load.
- Charging Speed: Some chargers with higher capacity may offer faster charging speeds, making them more efficient for quick top-ups.
- Durability and Weather Resistance: Higher capacity batteries can sometimes come with added features such as rugged designs that are beneficial in outdoor conditions.
- Usage Duration: The more capacity a battery has, the longer you can use devices, enhancing your ability to navigate, communicate, or capture memories.
Device Compatibility: The capacity of a portable battery charger dictates how many devices it can support and for how long. Chargers with higher capacity can often charge multiple devices simultaneously or provide enough power to sustain larger devices like tablets or cameras, which is essential for maintaining connectivity and enjoyment during long hikes.
Weight and Size: Battery capacity often correlates with the weight and size of the charger, which can impact your backpacking load. Backpackers must find a balance between capacity and portability to ensure that they are not overburdened while still having sufficient power for their needs.
Charging Speed: Some chargers with higher capacity may offer faster charging speeds, making them more efficient for quick top-ups. This is particularly useful when time is limited during breaks, allowing backpackers to recharge devices rapidly before continuing their journey.
Durability and Weather Resistance: Higher capacity batteries can sometimes come with added features such as rugged designs that are beneficial in outdoor conditions. A durable charger can withstand drops, moisture, and extreme temperatures, ensuring reliability during your adventures.
Usage Duration: The more capacity a battery has, the longer you can use devices, enhancing your ability to navigate, communicate, or capture memories. This extended usage is crucial for ensuring safety and enjoyment, especially on multi-day trips where access to power may be limited.
Why Is Port and Connectivity Versatility Important for Backpackers?
Furthermore, studies have shown that access to power sources can reduce anxiety related to getting lost or facing emergencies (Hawkins et al., 2019). When backpackers know they can recharge their devices, they are more inclined to explore off-the-beaten-path locations, ultimately promoting a more fulfilling and adventurous experience. Therefore, the combination of portability, connectivity, and adaptability in battery chargers directly correlates to the safety, convenience, and enjoyment of backpackers in the wilderness.
What Are the Top Portable Battery Chargers Recommended for Backpacking?
The best portable battery chargers for backpacking combine capacity, weight, and ruggedness to meet outdoor needs.
- Anker PowerCore 20100: This charger is known for its high capacity and dual USB output, making it perfect for charging multiple devices on the go.
- <strong<RAVPower 26800: With a massive 26,800mAh capacity, this charger can easily power multiple devices several times and features fast charging technology.
- Goal Zero Sherpa 100PD: Designed for outdoor enthusiasts, this charger is lightweight and includes a built-in AC inverter, allowing it to power laptops and electronics efficiently.
- Zendure A2: This compact and durable charger is built to withstand the rigors of outdoor use while still providing ample power in a lightweight form.
- Mophie Powerstation Plus XL: This stylish charger includes integrated cables for both USB-C and micro USB, making it versatile for various devices while providing a solid power capacity.
Anker PowerCore 20100: With a 20,100mAh capacity, the Anker PowerCore can charge smartphones up to seven times, making it ideal for long backpacking trips. It features PowerIQ and VoltageBoost technologies, ensuring fast charging for all your devices.
RAVPower 26800: The RAVPower 26800 boasts a powerful capacity that can charge an iPhone multiple times before needing a recharge itself. It has three USB ports, allowing you to charge multiple devices simultaneously, and includes advanced charging technology for efficiency.
Goal Zero Sherpa 100PD: Weighing just over two pounds, the Sherpa 100PD is lightweight yet powerful, perfect for backpackers needing to charge laptops and larger devices. Its versatile charging options include USB-C and AC output, accommodating a wide range of electronics.
Zendure A2: The Zendure A2 is crafted from durable materials, making it resistant to scratches and drops, ideal for rugged outdoor environments. Despite its small size, it provides a substantial amount of power and can charge devices quickly, making it a reliable companion on the trail.
Mophie Powerstation Plus XL: This portable charger not only offers a high capacity but also features built-in cables, eliminating the need to carry extra cords. It is compatible with a variety of devices and has a sleek design, making it as stylish as it is functional.
Which Brands Are Known for High-Quality Backpacking Chargers?
The main brands known for high-quality backpacking chargers include:
- Anker: Anker is renowned for its robust and efficient portable chargers, offering high-capacity options that can charge multiple devices simultaneously. Their PowerCore series is particularly popular among backpackers due to its lightweight design and fast charging capabilities, ensuring devices are powered up quickly on the go.
- RAVPower: RAVPower provides a variety of portable battery packs that cater to outdoor enthusiasts, with models featuring solar charging capabilities for extended trips. Their chargers often come with multiple output ports and smart charging technology, allowing users to charge their devices safely and efficiently.
- Goal Zero: Goal Zero specializes in solar-powered charging solutions, making them ideal for long backpacking trips where access to electricity is limited. Their products are designed for rugged outdoor use, featuring durable construction and the ability to harness solar energy, making them a sustainable charging option.
- Jackery: Jackery is known for its portable power stations, which provide substantial power capacity for charging multiple devices and even small electronics like laptops. Their lightweight and compact designs make them a favorable choice for backpackers who require reliable power sources during extended adventures.
- Zendure: Zendure offers high-performance portable chargers that are specifically designed for durability and efficiency, often featuring a rugged exterior that can withstand tough conditions. Their products come with high-speed charging technology and can maintain power retention over long periods, making them great for backpacking trips.
How Can You Identify the Best Budget-Friendly Options for Backpacking?
When looking for the best portable battery charger for backpacking, consider the following options:
- Anker PowerCore 10000: This compact charger is lightweight and provides a significant amount of power in a small package, making it ideal for backpackers.
- RAVPower 26800mAh Portable Charger: With a high capacity, this charger can recharge multiple devices multiple times, perfect for extended trips.
- Aukey 20000mAh Power Bank: Known for its fast charging capabilities, this option is great for quickly powering up devices on the go.
- Goal Zero Sherpa 100PD: This charger not only offers a large battery capacity but also features a solar panel option, making it suitable for eco-conscious adventurers.
- Zendure A2 Portable Charger: With a durable design and impressive efficiency, this charger is built to withstand the rigors of outdoor use.
Anker PowerCore 10000: This model is one of the most popular choices due to its lightweight design, weighing just around 6.35 ounces. It has enough capacity to charge a smartphone three to four times, and its compact size makes it easy to slip into any backpack or pocket.
RAVPower 26800mAh Portable Charger: This charger is ideal for longer backpacking trips because of its massive capacity, allowing it to charge multiple devices several times. It features multiple USB ports, so you can charge several gadgets simultaneously, which is advantageous for group trips.
Aukey 20000mAh Power Bank: This power bank is designed with fast charging technology that allows you to quickly recharge your devices, which is especially useful when you’re on the move. Its slim profile makes it easy to carry, and it also includes multiple output ports for charging multiple devices at once.
Goal Zero Sherpa 100PD: This charger is versatile, featuring both a high-capacity battery and the option to recharge via solar energy, making it perfect for eco-friendly backpackers. Its robust build and multiple output options, including USB-C, make it suitable for charging laptops and other larger devices.
Zendure A2 Portable Charger: Built with a rugged exterior, this charger is designed to handle the rough conditions of outdoor use, making it a reliable choice for backpackers. It also has a high conversion efficiency, ensuring that more of the battery’s energy goes into charging your devices rather than being lost as heat.
How Do Temperature and Environment Influence Your Choice of Battery Charger?
Temperature and environment play crucial roles in determining the best portable battery charger for backpacking.
- Temperature Range: The performance of battery chargers can vary significantly with temperature extremes.
- Humidity Levels: High humidity can affect the longevity and efficiency of portable battery chargers.
- Altitude: The effectiveness of some battery chargers may decrease at higher altitudes due to lower air pressure.
- Weather Resistance: Chargers designed for wet or rugged environments are essential for backpacking in unpredictable weather.
Temperature Range: Most battery chargers have an optimal operating temperature range, typically between 0°C to 40°C (32°F to 104°F). In extremely cold conditions, battery efficiency drops, leading to longer charging times and reduced capacity, while high temperatures can cause overheating and damage to both the charger and the devices being charged.
Humidity Levels: Excessive humidity can lead to corrosion, affecting the internal components of portable battery chargers. This can result in decreased performance or even failure, making it essential to choose a charger with good moisture resistance if you expect to encounter wet conditions while backpacking.
Altitude: At high altitudes, the air pressure is lower, which can influence the chemical reactions within batteries and chargers. Some chargers may not perform as efficiently, leading to slower charging times or reduced output, so selecting a model that specifies its functionality at altitude is advisable for backpackers heading into mountainous areas.
Weather Resistance: Since backpacking involves exposure to various weather conditions, it’s critical to choose a portable battery charger that is weather-resistant or waterproof. Chargers with rugged designs or protective casings can withstand rain, moisture, and dust, ensuring reliable performance regardless of the environmental conditions encountered on the trail.
What Maintenance Tips Can Help Extend the Lifespan of Your Portable Battery Charger?
To extend the lifespan of your portable battery charger, consider the following maintenance tips:
- Regularly Charge and Discharge: Keeping your battery charger at optimal levels is crucial for maintaining its health.
- Avoid Overcharging: Leaving your battery plugged in after it reaches 100% can lead to decreased battery efficiency over time.
- Store in a Cool, Dry Place: Extreme temperatures can negatively affect battery performance and longevity.
- Use Quality Cables: Using subpar charging cables can lead to inefficient charging and potential damage to the battery.
- Clean the Ports: Dust and debris can accumulate in charging ports, which can hinder performance and create connection issues.
Regularly charging and discharging your battery charger helps to maintain its capacity and efficiency. Ideally, you should use the charger at least once a month to keep the internal components active and prevent them from degrading due to inactivity.
Avoiding overcharging is essential as it can lead to excessive heat, which can damage the battery cells. Many modern chargers have built-in mechanisms to prevent overcharging, but it’s still wise to unplug the charger once it’s full to ensure maximum lifespan.
Storing your portable battery charger in a cool, dry place protects it from extreme temperatures that can cause battery swelling or capacity loss. Ideal storage conditions are usually between 32°F (0°C) and 77°F (25°C).
Using quality cables ensures that the charging process is efficient and without risk of short-circuiting. Cheap cables can sometimes fail to deliver the right voltage or current, leading to potential damage to the charger.
Cleaning the ports on your charger should be a part of regular maintenance. Dust and debris can obstruct connections, leading to inefficient charging or even damage to the internal components if not addressed.
How Do You Properly Store a Portable Battery Charger While Backpacking?
Properly storing a portable battery charger while backpacking is crucial to ensure its longevity and effectiveness.
- Keep it in a protective case: Use a padded or hard-shell case to shield the charger from physical damage.
- Store in a dry place: Ensure the charger is kept away from moisture to prevent damage from humidity or water exposure.
- Avoid extreme temperatures: Keep the charger at a stable temperature, avoiding both extreme heat and cold, which can affect battery performance.
- Disconnect cables when not in use: Remove any cables attached to the charger to avoid accidental discharges and potential short circuits.
- Charge before storage: Store the charger with a partial charge, usually around 50%, to maintain battery health during long periods of inactivity.
Using a protective case can prevent scratches, dents, or other forms of damage that might occur during your journey through rugged terrains.
Moisture can severely compromise the internal electronics of a portable battery charger, so it’s essential to keep it in a dry compartment of your backpack, away from wet gear.
Extreme temperatures can lead to reduced battery capacity and life, so it’s best to store the charger in a temperature-controlled area of your pack, away from heat sources or cold air.
When not in use, keeping the cables disconnected helps to prevent the battery from depleting and protects the connectors from wear and tear.
Maintaining a 50% charge when storing your portable battery charger is ideal, as this level helps prevent the battery from going into deep discharge, which can cause permanent damage over time.
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