B-3 battery charger is an economical balance charger for 7.4v and 11.1v batteries. It is a better choice than the standard battery charger supplied with you gel blaster. It balances the battery cells to keep your battery in better condition and provides a quicker charge time. NEVER CHANGE BATTERIES UNATENDERED. WE RECOMMEND CHARGING YOUR BATTERY OUTSIDE OR IN A LIPO BATTERY BAG FOR YOUR SAFTLY.