Sophiaxiong, are you asking about NiMh or Lion batteries ?
I have some Lion EBL 18650 and 18500 that was purchased before knowing better not to.
The 18650 3000 mah weighs 43g vs a Samsung 30Q at 48g and checked 2500mah.
Another problem was leakage after moderate usage of one yr. Lifespan is short, made in China.
Also purchased some AA NiMh that did not last one yr due to leakage.
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Buying batteries is something you will need to research here on BLF to get accurate answers before buying. 
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Hope that helps some.
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There is a lot of info here if you search for it.
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