Maha PowerEx 9.6V 230mAh IMEDION Battery can be stored for an extended period of time without substantial loss of power. It retains up to 85% of charge after one year of storage. It has true 9.6v 230mAh rating and the actual voltage is slightly higher than standard 9V alkaline batteries. The PowerEx 9.6V 9V batteries will operate paintball hoppers and wireless devices that other 9V rechargeable batteries cannot power. It enables wireless microphones and paintball hoppers to last longer and work faster.