Polymer Li-Ion Battery 3.7V 750mAh 40x25mm (102540)
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Prices updated: 13 Oct 2026
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About this product
A 3.7 V, 750 mAh rechargeable lithium-ion polymer (LiPo) single cell, 40x25 mm, in the 102540 format. Used to power small wearable, IoT and DIY electronics projects that run from a single Li-ion cell. Charge it only with a single-cell Li-ion charger.
Specifications
- Nominal voltage
- 3.7 V
- Capacity
- 750 mAh
- Dimensions
- 40 x 25 mm
- Thickness (from 102540 designation)
- 10 mm
- Chemistry
- Li-ion polymer (LiPo)
- Rechargeable
- Yes
Frequently asked questions
How do I charge this cell safely?
Use a single-cell Li-ion/LiPo charger that stops at 4.2 V, such as a TP4056-based module with protection. Never exceed 4.2 V per cell.
Does it need a protection circuit?
Yes, use a board with over-charge and over-discharge protection. Check whether your specific cell includes a built-in protection circuit, since many bare 102540 cells do not.
