I posted this in another forum but it really belongs here: 

 

 

Cheers

It can be used for 110 and 230 volt. 2000 W? Should be 2000 mAh.

 

  It is based on how long a battery will last when power is drawn constantly, e.g. a 2000 mAh battery will power a device drawing 100 mAh for 20 hours. Short for ampere, this is a unit of current, not a unit of charge.

 

   But it all depends on how old it is. The batteries do not get better when you're using it constantly through the process of charging and recharging.