Thanx for lab tests, its good work.
Now real life test.
I have 900Wh Samsung 35E 52V 14S 5P Jumbo Shark battery (
https://fasterbikes.eu/de/akkus/225/900wh-flaschenhalter-akku-52v-14s-5p-jumbo-shark?c=47 ) on Giant Trance X2 + BBSHD. I ride single mountain trails.
I take good care of battery:
- charge to 90% with 5A, discharge to 10% (~45V) with average of 20A (1000W). Peaks 1600W for few minutes.
- storage and charge at 22C
- dont ride with cold battery
- average batt temp is ~40C, max 57C (very rare).
After about 1 year, 4000 km and 100 cycles I measuerd my battery with 200W load. Capacity went down from 17Ah to 15Ah (850Wh to 750Wh). So now I am at 88%. :? This is confirmed with my 200W load calculation and BMS display (BT app).
Internal resistance is ok for now, at 30A it sags for 5.5V. This means 65 mOhm per cell.
I am still satisfied with performance if it stays this way for some years. From your graphs it seems it hopfuly will :wink: