A:AnswerIt depends on the device you're using it in. In general, they don't last as long as alkaline batteries, but on the plus side, they are rechargeable.
A:AnswerMost of the chargers in the market are compatible worldwide you may need adapter for pins you need not worry about voltage just chech your charger if it says 110-240 v you are good
A:AnswerThese are claimed to be 850mAh but I have not found any definitive test info to verify this. There is at least one data sheet online that shows them to be only 700mAh. As most of these rechargeable batteries, the voltage is usually 1.2 volts. Sorry I can't be more precise.
A:AnswerYes and Yes to both your questions. PS -- I have read some reviews that 1.2V may not work as well for devices designed for 1.5V, but I have never had a problem -- 1.2V works perfectly on all my stuff. I also think the quality of rechargeable batteries has increased a lot in the years. I have a few old Radio Shack batteries that died early.
