Can someone give me a basic 101 overview of LiPo battery percentages and how to interpret (or point me to a resource)? We got our Octoquad flying and I’m doing multiple series of tests to learn about predictable power consumption and flight times possible on a single charge. Here’s what I think I know about LiPo:
- Nominal, resting voltage of a LiPo cell is 3.7
- Max, full charge of a LiPo cell is 4.2
- Storage voltage is +/- 3.8
- Minimum discharge voltage (don’t go lower or you could damage battery) is 3.0-3.3
- I understand we use voltage vice capacity to assess how charged a battery is because of difficulty in measuring capacity.
For discussion purposes, I’m using a Tenergy LiPo 5-in-1 tester on Tattu 30,000 6s batteries.
Here’s what I need help understanding:
What does the percentage rating mean ~ specifically, what constitutes 0%?
Presumably, if a tester says your 6s battery is 98-100% charged and voltage is 25.2 then 100% = 25.2 volts. But clearly 0% is NOT 0 volts since a ‘dead’ battery is not necessarily a fully discharged battery. Is 0% represented as the minimum required 3.0-3.3 per cell or 18-19.8 volts?
If yes, then the 0-100% charge range is measuring how much of the 5.4 volts is available for use (25.2 – 19.8)? That appears to be the case. At 39%, volt total measured was 22.88 which is +/- 39% in the ball park. Battery is smart enough to know how much of total voltage is available for use and testers calculate that as percentage.
Thank you for corrections or validation.