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The nominal voltage of single lithium polymer cell in battery pack is 3.7V,but this can go down to 3.0V during discharge, and up to 4.2V when fully charged. A lithium polymer battery pack is composed of two or more lithium polymer cells put together in series for increased voltage to 7.4V(2S1P),11.1V(3S1P), 14.8V(4S1P),18.5V(5S1P)… or in parallel for increased battery capacity. |  |
| Lithium polymer battery pack configuration is denoted by the number of cells in series and the number of cells in parallel. 4S2P pack would have four cells in series, and two cells in parallel, using a total of 8 cells. 4000mAh 4S2P pack would have a capacity of 4000mAh (2 x 2000mAh), and a voltage of 14.8V (4 x 3.7V). It would internally consist of 8pcs 3.7V 2000mAh lithium polymer cells. The cells would be doubled up (2P part of 4S2P) to get 4000mAh, and there would be three in series (4S part of 3S2P) to get 14.8V | |
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