Then I think it will be better for me, to have the new one (of 1500mAh) correctly measured and know that when battery status says that the old battery have 300 / 1500 it really have 82 / 1500. So I could change it when nearing that number.

Now when using new 1500 battery, it last a lot of time with 0/1282, so I don't know when it is really near end.

Yes I know, I can recharge Litium batteries when I want, but I obviously prefer to change of battery less often, and benefit from that extra 300mAh.

¿Could I do that?