First experience with lifepo4 AAA cells These cells give abut 3.47 V when full, so if you have a device that uses 2 normal AAA, then you can use one of these and a dummy (read shorted) battery for the other. You will have more voltage, but less capacity, but a lot more recharges (about 2000). I have got these small AAA lifepo4 and they state 200 mAh, a lot less then the 750 or so on a normal AAA eneloop.
Charge voltage with current limit at 3.5V set to 1/2 C. Discharge low voltage cutoff should be set higher, equipment must be able to handle the 3.45 V versus 2 x 1.2.. Full 200 mAh AAA on 180 mA load drops to 3.05 V here. Same at 120 mA load, strange Ri. Anyways Once of these runs my gamma spectrometer for an hour, versus 2 AA nimh for 8 hours...
So where should I use these batteries... if space and safety constraints perhaps.