Re: Charging 12V mini-pack from car battery

<lion_elk@xxxxxxxxxxxxxx> wrote in message
news:1146178496.648758.31110@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
I need to run a 12V low-power electronic device from a small
rechargeable battery pack.

Could such a pack be recharged or maintained at full charge by leaving
it plugged into a car's 'cigar lighter' socket more or less
continuously, whether or not the engine is running?

If not, what additional components would be required to avoid run-down,
overheating, exhaustion etc?

Alternatively, is there a cheap commercial device for trickle-charging
a little 12V pack from a big 12V DC source?

What type of batteries would be most suitable?

A typical 12 pack wont charge unless the engine is running, unless you boost
the voltage with a dc-dc converter.
alternativly if you can get away with spliting the pack into 2 x 6 volt ones
...
you realy need something to limit the current for a smal pack and it depends
what type it is how big etc, eg resistor, current controled regulator, at
the very least a fuse !

I tend to use AA size NimH @ 2AH as theyr quite versatile and easy to get.
depends how much capacity you need, and how much you want to pay.

Colin =^.^=


.

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