Product Description
Power Li Polymer Battery 302030 3.7V 120mAh Lithium Battery Cell
For Bluetooth Keyboards
| NO. | Items | Specifications |
| 1 | batteries | 3.7v 120mah lipo battery |
| 2 | Charge voltage | 4.2V |
| 3 | Nominal voltage | 3.7V |
| 4 | Nominal capacity | 120mAh 0.2C Discharge |
| 5 | Charge current
| Standard Charging:0.2C
Rapid charge: 1.0C |
| 6 | Standard Charging method | 0.5C CC(constant current)charge to 4.2V, then CV(constant voltage
4.2V)charge till charge current decline to ≤0.05C |
| 7 | Charging time
| Standard Charging:2.75hours(Ref. )Rapid charge: 2hours(Ref.) |
| 8 | Max.charge current | 0.5C |
| 9 | Max.discharge current | 1.0C |
| 10 | Discharge cut-off voltage | 2.5V0.25V(0.2C) |
| 11 | Operating temperature | Charging: 0 °C ~45 °C Discharging:0 °C ~45 °C |
| 12 | Storage temperature | -10°C~ +45 °C |
| 13 | Dimension | Length:30±0.5mm (not including tabs)
Width:20±0.5mm
Thickness:3±0.2mm |
| 14 | Drop Test | The cell is to be dropped from a height of meter twice onto
concrete ground. No fire, no leakage |
| 15 | cycle time | ≥500times |
Daily Usage Recommendations
Device Compatibility and Maintenance
For use only with devices marked "3.7V Small Lithium Polymer
Battery" (e.g., smart bracelets, micro sensors). Do not use with
other battery specifications (e.g., 3.6V steel-cased batteries) to
prevent voltage mismatch and device malfunction.
Inspect the battery regularly (every 1-2 months). If you notice
bulging of the aluminum-plastic film or leakage from the edges
(e.g., sticky white powder), discontinue use and replace the
battery immediately to prevent short circuits caused by continued
use.
When the device is idle for an extended period (over 1 month),
charge the battery to 3.7-3.8V (approximately 50%-60% capacity)
before storing it, rather than fully or emptying it. This will
reduce cell degradation.
During idle periods, recharge the battery every 3 months to
maintain the voltage around 3.7V to prevent prolonged battery
drain.
Storage and Protection Recommendations
Environmental Control
Store at a temperature of 10-25°C (optimally 20°C) and humidity
<60%. Avoid humid environments (such as bathrooms) or near heat
sources (such as heaters or ovens) to prevent damage to the
aluminum-plastic film and electrolyte deterioration.
Store the device in an insulated container (such as a plastic box)
away from metal objects (keys, coins) to prevent short circuits
(which may cause sudden overheating).
Safe Isolation
Do not store batteries with flammable or explosive materials (e.g.,
alcohol, lighters). If storing multiple batteries, wrap each
battery individually in an insulating bag to prevent contact
between the terminals.
Transport Protection Recommendations
Insulation and Cushioning Packaging
When transporting a single battery, wrap the positive and negative
terminals with insulating tape (or use a dedicated insulating cap)
and then place the battery in bubble wrap or a foam bag to prevent
damage to the aluminum-plastic film due to compression during
transport.
When transporting in bulk (e.g., 10 or more batteries), use
anti-static packaging and space each battery apart to prevent
static electricity from collisions and friction.
Avoiding Taboos
During transportation, avoid prolonged exposure to direct sunlight
(e.g., in a car trunk in summer) or freezing (outdoor transport in
winter). Batteries can be placed in an insulated bag to maintain a
temperature between 10-30°C.
Main Application:
Portable Electronic Devices
Suitable for small electronic products such as Bluetooth headsets,
electronic scales, and toys, these batteries are compact,
lightweight, and offer moderate battery life, meeting the power
needs of everyday low-power devices.
Consumer Electronics
Commonly found in devices like beauty devices and early childhood
education devices, their high energy density and stability ensure
long-term operation while supporting rapid charging and
discharging.
Energy Storage and Backup Power
Some models can be used in small energy storage systems or power
banks, such as dashcams and Bluetooth speakers. These batteries
offer excellent battery life while maintaining portability.
Industrial and Drones
Some ternary lithium batteries, due to their high power output, are
also used in devices such as drones that require instantaneous high
energy. However, 120mAh capacity batteries are generally suitable
for small drones or short-range missions.
Product pictures:
