Using D batteries in series to make mobile charger?
I will be going somewhere where there's no lower.
However, I would like to be able to charge my mobile devices while there.
I was thinking Of using batteries (either AA or D) In series connected to a USB car charger to charge say my iPhone.
I know how to do this - however, my question is whether I should connect them to 12v or to 6v and why. Also, does this method sound effective to you? Do you have any idea how quickly I would go through the batteries (how many charges I would get out of them)?
If your mobile charger adaptor is designed for 12v input, then you need to have 12v from the batteries. That is inefficient, and if you want to jury rig an adapter, 6 volts from the batteries will work for a USB device. But i don't recommend either way. What i suggest is you look into getting a solar panel/USB adapter. Carrying around a couple dozen D batteries just to recharge an iphone is a lot of weight to lug around if you are back packing.
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