I have a Pi application where there is an interruptible but generally reliable 12-15V DC supply. The plan is to put the 12-15V supply on input 1 of the MoPi-2 with a pack of 8 rechargeable NiMH AA batteries on input 2. The DC supply would also power input to the charger point (X1). The MoPi-2 will automatically cut over to input 2 if input 1 drops out and will shut down gracefully if the battery pack discharges.
Could anyone point me at suitable circuit for the charger or, alternatively, at a piece of kit that will do the job? If it made life easier, I could get a LiPo battery but I already have the AA battery holder and batteries so that seems like a sensible starting point. Circuit design is beyond me but soldering is OK 8-}