Professional grade lithium polymer 9V batteries originally designed for TV equipment now available for all of your high-drain 9V applications. Great for churches and schools - anywhere wireless microphones are used as well as paintball guns, toys and other 9V uses. Charge in the IPower IP-FC904U battery charger. ***NOTE:For optimum performance: * To extend the shelf life of the battery, recharge the battery every 3 months when in storage. * Always charge the battery fully before storage.