Thread: Discussion Is this behavior a sign of a bad lipo cell? View Single Post
 May 11, 2012, 05:46 AM Jack USA, ME, Ellsworth Joined May 2008 18,096 Posts What hoppy said on the 3.7V and 80% cutoff! That is great advice. When I was getting started with LiPOs I found a couple of his posts with the testing info he mentions and started using the 3.7V per cell, as measured under load, for my low voltage cutoffs and ending flights. And I still have nearly every LiPO pack I have ever bought. Here a summary of his info and links to his posts: LIPO Capacity @ Voltage per cell (cell voltages, multiply by cell count for pack voltage, i.e. for 3S pack multiply x 3) 4.20v = 100% 4.03v = 76% 3.86v = 52% 3.83v = 42% 3.79v = 30% 3.70v = 11% 3.6?v = 0% Capacity below 3.7V "resting" is not usable for flying, it's where the battery voltage dumps and damage begins. Avg Resting V % Remaining Capacity (for 3S pack, divide by 3 for cell voltages) 11.0V-- 17% (3.67V per cell) 11.1 --- 26 (3.70V per cell) 11.2 --- 30 (3.73V per cell) 11.3 --- 37 (3.77V per cell) 11.4 --- 46 (3.80v per cell) 11.5 --- 50 (3.83V per cell) 11.6 --- 57 (3.87V per cell) 11.7 --- 63 (3.90V per cell) 11.8 --- 69 (3.93V per cell) 11.9 --- 77 (3.97V per cell) 12.0 --- 83 (4.00V per cell) These values are the average of many discharges of different size/age/brand packs. As you can see, the values are not absolute. A new pack gives different results from a well used pack but the chart is still useful for the broad picture. Thanks again, hoppy! Jack