To understand the performance of a Li-ion battery pack


To understand the performance of a Li-ion battery pack

2009/08/09 23:35

Manual log data

log_time Voltage (V) display_scale
0:43 4.1 100%
10:30 3.86 75%
12:00 3.83 75%
13:50 3.81 75%
15:50 3.78 50%
17:00 3.76 50%
22:30 3.75 50%

Nomalised data with interpolation of the time axis


prelim-conclusion

1) the capacity of the Li-ion cell is able to confirm to directly proportional to lasting of service time

2) expect a cut off voltage about 3.6V

3) voltage decay under load is expected non-linear at whole capable supply range

4)
quick charger with higher-C is not benefiting the cell performance in
term of time of discharge or supply voltage unless over charge the cell
without aware offset the cell life

precaution

protection
circuitry of the Li-ion battery is prone to damage once the discharge
current exceeds the limit from time to time, but the Li-ion cell itself
will has no permanent damage. Beware the over charge, over discharge and
any safety issue with Li-ion battery usage.

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