I can agree that the low battery indicator is hypersensitive. .
I sometimes go anywhere from 2 to 3 weeks before replacing them.
I usually get two more warning windows before they go dead.
I tried rechargeable batteries – they lost their charge really fast and I felt I was replacing the rechargeable all the time.

I recycle other people's Alkaline batteries in my Mighty Mouse. The battery warning will pop a window up, but I usually get a couple weeks out of the batteries. Otherwise I use NiMH batteries. They give a battery warning with a week of charge remaining. Remember that NiMH (other than the new pre-charged type) loose their charge in one month even without being used...

I too used to use Rechargeable, but found out they the died too quickly. I started using the Energizer Lithium Ion batteries and they last for about 6 months before changing. I am going to give rechargeables another try though (try to be good about recycling). I found the Rayovac Hybrid rechargeables that peaked my interest, so I order a pair of 'em.

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Cheers:
Bob

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I highly recommend voltage testing disposable batteries before getting rid of them. An inexpensive digital multimeter works well for that purpose.

When my Bluetooth keyboard runs low on power usually at least one of the four original batteries still has nearly a full charge. I'll check if NiMH rechargables will work okay in that keyboard as soon as the current batch of alkalines I've reused runs out. I was getting about a month from 'em in a non-Mighty Bluetooth mouse before switching to a wired Mighty mouse (whose scroll pea hasn't worked for over a year, sigh, and stopped responding to any external methods of cleaning that had previously temporarily helped).

Rechargeables don't hold a charge long. They drain as they sit unused, so even when they're in the mouse and it's not being used, they're losing charge.

Try the Eneloop batteries. They're a new breed of rechargeables that don't lose their charge. I've been using these in my BT mouse & keyboard and they last much much longer... similar to alkalines.

I'll second the recommendation for Sanyo Eneloop batteries. They don't have as much charge in them to start off with (only 2000mAh) compared to some of the better NiMh which are 2500+ BUT as mentioned, they don't sit there discharging when doing nothing. They won't last as long in constant use theoretically but for keyboards, mice and cameras I find that in *practice* they last much longer.

Buy two sets and charge the second set. It'll still be charged months later when the first set runs out so you're not let down by a discharged second set of NiMh.