well i have some pasnosonic AA's...there profesionally made (obviously) and the charger gives out a constant 550mah, for batteries that deliver up 2200mah, so they charge at roughly a quarter of there output current. so i'm guesing a 1/4 is a safe Ampere measure meant
But since your cells are in a pack i could be something to do with sereis or parralle concept...
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