Battery size: AA dia.14mm, length 50mm,AA batteries are commonly used inToys,Portable tape ,Clocks ,Electronic games,Smoke alarms,PDA's,Flashlights,DVD, MP3, and digital camera, electrical toy, and more. Up to 2000mAh higher capacity battery Please check if your charger can charge for Alkaline batteries. Thanks! Alkaline rechargeable batteries can be tested with a multimeter and the no-load voltage can reach 1.6V. This is the same as the characteristics of alkaline dry batteries. This high voltage advantage is unmatched by NiMH batteries. It is suitable for razors, LED lighting, microphone and other electrical appliances that require high potential but will not be used for a long time. Alkaline environmental protection material Alkaline batteries are environmentally friendly battery, use a professional charger, do not use NiMH / NiCd battery charger, otherwise it will cause the battery to explode or leak,It is not recommended to use electrical appliances with long-term slow discharge such as wireless keyboards, mice and remote controls, which may easily cause overdischarge. Second charge effect! !