I discovered Sanyo Eneloop batteries (AA or AAA) iya few years to my satsfaction! The only ones that do not discharge into the devices and accept several hundred charge / discharge cycles. (Unlike lambda batteries it rip you after 3 months). Whether in remote controls, toys or children dnas photographic accessories, uses always give satisfaction. The slight additional cost is offset by a reliable and prolonged use over time. Too bad that these batteries do not exist 9v. or R14 for lighting lamps. By the way there is a model with solderable terminals for a fixed combination of rechargeable batteries for the constitution to include drills. cordially