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To convert watts (W) to milliampere-hours (mAh), you need to know the voltage (V) of the battery. The formula to convert watts to mAh is:
mAh = Watts×1000/Volts
Assuming a common voltage of 3.7V, which is typical for lithium-ion batteries.
Below is a table showing the conversion of various watt values to mAh, sorted from smallest to largest, assuming a voltage of 3.7V.
Watts (W) |
Voltage (V) |
mAh |
5.00 |
3.70 |
1351.35 |
10.00 |
3.70 |
2702.70 |
15.00 |
3.70 |
4054.05 |
20.00 |
3.70 |
5405.41 |
22.50 |
3.70 |
6080.41 |
30.00 |
3.70 |
8108.11 |
40.00 |
3.70 |
10810.81 |
65.00 |
3.70 |
17567.57 |
100.00 |
3.70 |
27027.03 |
150.00 |
3.70 |
40540.54 |
160.00 |
3.70 |
43243.24 |
200.00 |
3.70 |
54054.05 |
300.00 |
3.70 |
81081.08 |
500.00 |
3.70 |
135135.14 |
600.00 |
3.70 |
162162.16 |
1000.00 |
3.70 |
270270.27 |
To convert 10 watts to mAh at 3.7V:
mAh=10×1000/3.7≈2702.70 mAh
To convert 20 watts to mAh at 3.7V:
mAh=20×1000/3.7≈5405.41 mAh
To convert 100 watts to mAh at 3.7V:
mAh=100×1000/3.7≈27027.03 mAh