You can use a 510 charger to charge an eGo battery. However, there's one problem beyond how long it will take to charge. The longer a battery spends charging, the more likely it will overheat. So, if you must use a 510 charger, take the eGo off and let it cool down periodically so that it doesn't overheat.
Or, even better, just buy an eGo charger.
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