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Connecting Batteries in series

lobstermash

Propaganda machine
Mentor
#2
Hmm, yeah, a little dicey, as the internal resistance of the higher C rated battery is significantly lower and therefore it'll supply power more rapidly and probably drain quicker. These packs will also likely have different voltage sags under load so would affect your overall voltage.
 

pgerts

Old age member
Mentor
#3
Make sure to connect in series - and it will be fine.
Never discharge more than the lowest rating.
Be aware that the 1300 mAh could be a little off if the batteries are from different suppliers.
Dont use full capacity or connect supervision (cell alarm) for each battery to be sure not to discharge more than allowed.