High-quality Philips LR14 C Alkaline powerlife batteries.
Alkaline batteries mean more power to your battery-driven sex toys. Alkaline batteries are six times more effective than the previously most used zinc-carbon-batteries. They have a shelf-life of up to 5 years.
All batteries suffer a certain amount of energy loss while they are not in use. Philips guarantees that their Alkaline powerlife batteries will contain at least 80% of their original amount of energy in the period up until their use-by date.