I don't know if this is the right place for my question so please excuse me if it isnt.

A friend of mine owns two 3DS's and there is one weird Problem with one of them. The problem is that the battery of NDS #1 lasts for 1 hour even if you play or not. If u take the battery from nds#1 and change it with the one from nds#2 it's the same. but both battery lasts more then 3 hours on nds#2. So nds#1 has a hardware malfunction like defect condensator?
I hope anyone knows a solution

I'm not sure what could be the cause of this.
Have you tampered with it?
Did you take the back off just to change/check the battery?
Has it ever been dropped?

It's probably best to send it off to Nintendo, see what they make of it.

It's not tampered.
And the back was taken off to change batteries, nevermind what battery u put in the don't last longer then 1 hour.
Hmm it's some years old do Nintendo make if for free?
My friend want to sell it to me for 55€