Need NiMH flat top AA 1.2v battery w/quick charge & OK self discharge

[xevious]

There's no question that Eneloop batteries are superior to conventional NiMH batteries. However, they do not make a flat top cell available. So, I need another kind of cell.

My application is a Braun shaver. It has OEM 1.2v AA NiMH cells of unknown mAh rating that are depleted and won't hold a charge for very long. This is after 6 years of use, which isn't all that bad actually. Replacing with the same cell would be acceptable.

I've found quite a number of possible alternatives. Sanyo (1650mAh), Varta (1600mAh), Tenergy (2300mAh), and various unbranded models (1500mAh, 1800mAh, 2200mAh). I figured the better the mAh rating, the better off I'd be--the shaver would last a lot longer on a charge. BUT, I didn't consider the fact that charging would take a lot longer.

So, here's my requirement for NiMH cells, ones that:

• Fully charge within 60 minutes.
• Will provide about 50 minutes of runtime, in multiple segments over time (never 50 minutes all at once).
• Will retain the current charge with a reasonable self discharge rate, such as from full to 75% in about 3 months.

The Tenergy 2300mAh cells provided good clean power, but I had some odd behavior from the shaver. First run it wouldn't last beyond 4 shaves (days). I then recharged it and the shaver wouldn't shut off the charge indicator even after 3 hours. Actually went to go discharge the thing and, weirdly enough, it ran for 2.5 hours! Of course, that was in one shot (with a few couple minute breaks along the way, so as to not over stress the motor).