Polymer Li-Ion Single Cell Battery 3.7V 750mAh 40x30x4mm (403040)
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Prices updated: 13 Oct 2026
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About this product
Flat single-cell polymer Li-Ion battery rated at 3.7V and 750mAh, measuring 40x30x4mm. It suits compact projects such as wearables, portable sensors and small custom devices where space is limited. Use it only with a charger and protection circuit designed for single-cell Li-Po or Li-Ion packs.
Specifications
- Chemistry
- Polymer Li-Ion
- Nominal voltage
- 3.7 V
- Capacity
- 750 mAh
- Dimensions
- 40 x 30 x 4 mm
- Number of cells
- 1
Frequently asked questions
What charger should I use?
Use a single-cell Li-Po/Li-Ion charger with protection, such as a TP4056-based module, which limits the cell to 4.2 V. Do not connect the cell directly to a 5V supply.
Can I power a 3.3V board directly from this battery?
The cell voltage varies from about 3.0 V to 4.2 V, so it is not stable enough to feed a 3.3V board directly. Use a regulator or a boost/buck module between the battery and the board.
