I found that charging at 10A or higher with an end voltage of 8.44 (4.22V/cell) gives a fair bit more rip than when I was charging my batteries before at 5A with an end voltage around 8.39.
My friends have chargers that will charge to around 8.44V, but they can't charge higher than 7A. When I charged their batteries at 12A (2C), they noticed the extra oomph.
I didn't expect it would make any difference, but it does.
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