Product Description
702030 3.7v 400mAh 1.48wh Rechargeable Lithium Li-polymer Battery
Cell For Bluetooth Speaker
| NO. | Items | Specifications |
| 1 | batteries | 3.7v 400mah lipo battery |
| 2 | Charge voltage | 4.2V |
| 3 | Nominal voltage | 3.7V |
| 4 | Nominal capacity | 400mAh 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:7±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 | ≥800times |
Good performance in bluetooth speaker:
Outstanding Battery Life:
The 400mAh battery capacity is a high specification for Bluetooth
earbuds, enabling longer periods of continuous use compared to
traditional lithium-ion batteries (typically 200-300mAh). For
example, users have observed full-day battery life during commuting
and meetings, and multiple days of use on a single charge.
Size and Weight Control:
The polymer battery utilizes a soft-pack design, making it more
compact and lightweight (approximately 9.1g per unit), making it
easier to carry. This feature is particularly important in true
wireless earbuds, as it prevents excessive battery size from
compromising wearing comfort.
Safety and Lifespan:
Polymer batteries are leak-proof and non-polluting, offering
enhanced safety. Furthermore, they offer a cycle life of hundreds
of times (depending on the product), reducing the need for frequent
charging.
Main Application:
Bluetooth headsets:
Used as a charging case battery.
Smart bracelets/watches:
Suitable for smart wearable devices. Some models use this battery
for daily use.
Small electronic devices:
Includes drone accessories, locators, disinfection boxes, and other
applications where size and weight are critical.
Product Pictures:
