Is it just me or is it a problem? When my brand new iMac arrived, the Magic Mouse only had 5% battery left in it even though it was switched off at first (eliminating the chance it was drained during shipping or whatever.) I put some rechargeable in them 2450Mh (Energisers) and they drained within 7 days. I use about 6~ hours computing every day. And now I've tried some new Ansmann 2600Mh rechargeable and it's been less than a week and it's down to 49% already. (plus I didn't use it a full day yesterday, I was ill...) I really want to know whether yours last longer or is it normal?