Charging lithium ion batteries

[waht]

I have a couple of different lithium ion battery packs. On one pack charging current reads 0.1 amps, and on the other 1.5 amps.

I already charged the 0.1 amp pack with 0.1 amps, and seems to be working. Now, I'm sort of weary charging the other pack with 1.5 amps. Doesn't that seem too much current for a lithium ion battery? The packs contain multiple 4.2 V cells in series though.

 

[sl1solo76]

ehh it does seem a tad much, usually 4.2 cells like 1.2A currents on charge depending on how many cells you got in em

 

[stewartcs]

This may help...

Lithium ion batteries with a lithium iron phosphate cathode and graphite anode have a nominal open-circuit voltage of 3.6 V and a typical charging voltage of 4.2 V. The charging procedure is done at constant voltage with current limiting circuitry. This means charging with constant current until a voltage of 4.2 V is reached by the cell and continuing with a constant voltage applied until the current drops close to zero. Typically the charge is terminated at 7% of the initial charge current.

Source: http://en.wikipedia.org/wiki/Lithium_ion_battery

CS

 

[waht]

Thanks, I charged the thing with a constant of 1.5 amps, and leveled it with a constant voltage. Didn't heat up though.