Nikon DSLR battery project, LiPo charging

Both batteries are now charged, all went OK as expected. No heating was noticed in the battery, when touched by hand. During 4S LiPo charging, charger itself heated (not still too hot to touch).

Following figures below, show the main data during charging. 3S LiPo was charged with full current (2.1A). Even it was defined higher current - 5 Amps - for the Orion 4S 6400mAh LiPo, approximate value was 3.3Amp.

Charging data for 3S 2100mAh LiPo

Charging data for 4S 6400mAh LiPo