As a veteran FTCer, I recommend that you only charge the batteries at the lower 0.9A setting.
In our first year we used the higher setting and had a lot of trouble with overheating. The batteries got so hot they melted the shrink wrap.
These batteries have good capacity, running at least 4 motors at high load for over 2 minutes in FTC. 20 seconds every 10 minutes won't need the high charge rate.
However having a spare battery in case yours fails would be prudent.
Quote:
Originally Posted by Techhexium
Yes it is amps, I mistakenly put in volts.
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__________________
Phil Malone
Garrett Engineering And Robotics Society (GEARS) founder.
http://www.GEARSinc.org
FRC1629 Mentor, FTC2818 Coach, FTC4240 Mentor, FLL NeXTGEN Mentor