what exactly do you want to do ?
I hope you intend those to be rechargeble AA batteries (more environmentally friendly) and I would suggest using a dry led acid battery like a car battery they are probably more competitive as far as cost per Watt.
if your going to power multiple devices you will need it to have a voltage regulator, charging NiMH battries is also more tricky than a led acid battery, to charge the lead acid battery you just need a DC power supply that is a couple of volts more than the battery, assuming it has diodes in it like the rectifier of a wall transformer you won't have to worry about putting a diode between the battery and power supply, you will need a resistor of a value equal to (DCin-battery volts)/amps to charge.
i do though recommend using the dedicated adapters for stuff mainly because what you propose is such a wasteful method:
you will charge batterys, this in itself is probably only 50 efficient (for every W charged 2 watts will be consumed as battery heat and charger overhead), you will then do the same thing again having to possibly drop the voltage with a regulator loosing more efficienzy to charge yet more batteries, you will end up using ten time the power you get in the end, ok I know we are talking small power here but remember this becomes an important issue as power consumption rises,
your best bet is to make a backup for each devise and where possible use standard batteries like AA and AAA these you can easily charge, for example I have 6 AAA batteries and 16 AA batteries and so I know where ever I go i am ok for 24-72 hours for power before I get to a wall socket that I can charge them up on.
perhaps if you supply more details we can help better your request is a bit too generic