On your new pack for the first charge you need to do a forming charge. Charge it for about 14 to 16 hours the first time with this wall wart charger. After that it will take about 8 to 10 hours (overnight). The forming charge is a critical step if you want the pack to last. I suggest that you look into getting an loaded voltmeter to keep a check on the voltage of the battery. Regular checks will help to lower the chances of a runaway do the the battery dumping.
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