You didn't say how much you wanted to spend.

I have an integrated battery Cygolite Expillon 350 and the battery is 3 years old and still holds it's charge as long as it did when it was new. When a rechargeable battery doesn't hold the charge for long it's usually because of initial user error...however this is user ignorance that the instructions do not cover on any rechargeable item from lights to drills! You have to charge up the battery upon receiving it for 24 hours regardless if the charger light says charged, then you have to go through 3 complete discharge and recharge cycles in a row (on these cycles the battery is finish charging when the light says so unlike the initial charge). Once you do that you should have a very reliable battery. Cygolite will warranty that battery of yours up to one year from purchase...err wrong, I just checked it's up to 90 days, but you can buy replacement battery if you want if yours is user replaceable like the Expilion.

Going back to AA lights, don't bother with AAA lights they'll be useless for lighting! This one http://harriscyclery.net/product/bus...eries-2692.htm runs on either AA rechargeables or AA alkalines, it will come with a charger and NiMh bats but you'll have to buy the alkalines; it's probably the best of both worlds (rechargeable and non rechargeable) on the market and it's on a huge closeout sale.