I'm making a handheld unit and the enclosure that was dictated to me does not have a battery compartment door on it...so I have to use internal rechargables. my. The unit will get used 1hr/day, 5V @120mA, so my initial thoughts are to use 2 or 3 AA in series. The product life needs to be 5 years without having to open the unit and replace totally dead batteries.
Anyone know if the Sanyo NiMH Eneloops (low self discharge) will last 5 years with proper care? How about the idea of just trickle-charging (C/10) the batteries overnight? A 13 hour timeout is still recomended for safety reasons - is there an easier way to do the timer than a separate processor?
Li-ion are $$. Are they so 'good' you recommend them?
Are pre-made battery charger OEM circuit-boards available? Somethng powered from a cheap wall-wart.
thanks in advance