Low battery level indicated on BT Keyboard

I went several months on the included alkaline batteries that were included on the included Apple BT Keyboard. After that I switched to Energizer Rechargeable (2500 mAh), and since then performance has been very poor. I can put in a fresh pair and I'm lucky if it shows 50% battery life. Constant disconnects, as well as the range of the device seems less. Is the keyboard a demanding device, are these batteries underpowered? I've had no issues with these batteries in other devices, including the magic mouse.

Rechargeable batteries are only 1.2 volts as opposed to the alkaline batteries which are 1.5 volts. It will not show 100%. I just put rechargeable batteries in my mouse. It showed 75% at first. Quickly went to 50% from there, but, they are holding up well since. I plan to use the alkaline in the keyboard since they last a long time as oppose to the mouse.
Try putting alkaline back in the keyboard and see if you get 100% reading. I don't think the keyboard is more demanding, but since it uses less battery than the mouse, I would just leave use the alkaline if you have no problems with them.

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