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Batteries: 4 Counts rechargeable 9V batteries, li-ion 6F22 9 volt battery.
No memory effect,improved low self discharge makes it still maintain 75% of capacity after 3 year of non-use
Batteries can be recharged up to 1200 times, high quality with professional care
Convenient operation without memory effect, can be charged anytime
Works with a variety of devices including smoke alarms, digital cameras, game controllers, toys, clocks, professional audio, and medical devices