Can I use rechargeable NiMh (Energizer 2650mAh) Batteries in a Beo4.

I can't see why not, but I also fail to see why. Beo4 uses extremely little power (probably a fraction of the amount NiMH batteries discharge by themselves when disconnected) and the cell voltage would be a little low to begin with. You would probably be recharging them every other month.

I recommend Energizer Lithiums. In applications like this they can last five times longer than alkaline batteries (it is not just ad speak!) and will not go old so fast. I have yet to replace a single one since I started putting them in all my remotes.

yes, but...

You better use normaal batteries,rechargeable batteries have less power.

also they are faster empty.

tournedos:

 I also fail to see why.

My batteries are running out and the rechargeables are the only ones I have spare.

OK, then just put them in

I use NiMh batteries in all applications remote / radio control systems - they hold charge better than Ni Cads and do not suffer recharge memory problems! I would recommend 'em

Tony