Also can you charge those batteries by hooking them up to a 12V source?
2007-09-10 06:08:36 · 5 answers · asked by jamiet757 2 in Consumer Electronics ➔ Other - Electronics
I am not trying to construct my own car battery, so don't warn me against it, I have a radio that needs a constant 12V source to save the memory, and I cannot get through the firewall to attach it to the fusebox or battery, so I was wondering if I could rig up a battery that would save the memory and be hooked into a switched 12V source so it would recharge when the car was on.
2007-09-10 06:10:00 · update #1
Also, can you charge those batteries by hooking them up to a 12V source?
I am not trying to construct my own car battery, so don't warn me against it, I have a radio that needs a constant 12V source to save the memory, and I cannot get through the firewall to attach it to the fusebox or battery, so I was wondering if I could rig up a battery that would save the memory and be hooked into a switched 12V source so it would recharge when the car was on.
2007-09-10 06:10:43 · update #2
Yes, putting eight AA batteries end to end (each + to - with the next) will create a 12V supply. (FYI - putting them in parallel; all + connected and all - connected together; will create a battery of 1.5V with 8 times the current capacity.)
No doubt this radio is intended to be installed in a car where the "12V switched" wire is connected to 12V "ignition" and the "12V backup" is connected to 12V constant "battery". There are two possible problems depending on how the internal circuitry of the radio is designed:
One is that the radio may draw additional power from the "12V backup" wire that you would be connecting to the AA batteries and may actually drain them when the car is running or the radio is on. Check if the voltage on the batteries drops when the car is running or the radio is turned on.
The other is that the "12V backup" wire may internally connect to the 12v supply from the car when it is running or the radio on. A car alternator puts out about 14.5v when the car is running and would charge (overcharge) them. Check if the voltage on your batteries exceeds their unconnected voltage when the car is running or radio on.
Good luck
2007-09-10 09:35:37 · answer #1 · answered by TahoeT 6 · 1⤊ 0⤋
8 AA batteries connected in series (end to end, plus to minus) will give a 12v supply. If this is just for backing up the memory then his should be fine, but I suspect that they will not last very long if you intend to power the radio with the sound on etc. with them.
As for recharging the batteries you will need some sort of charging circuit in order to do this safely, otherwise you run the risk of overcharging the batteries and either damaging them or in the worst case, causing a fire. I think that in car chargers are available for AA batteries, you could try an on-line electronics store like CPC in the UK or Radio Shack in the US.
2007-09-10 13:21:17 · answer #2 · answered by Anonymous · 0⤊ 0⤋
I don't know about charging the batteries, but you can put them in series or in parallel to create a 12V source.
FYI: series means they are all connected end to end, parallel means they are next to each other.
Series: --------
Parallel: ||||||||
2007-09-10 13:16:03 · answer #3 · answered by Love Zelda0 2 · 0⤊ 1⤋
Don't bother, they make a 9 volt adapter to do just this and you could charge it in a standard charger if you buy a rechargable, this is available at most auto parts stores.
2007-09-10 14:16:30 · answer #4 · answered by silencetheevil8 6 · 0⤊ 2⤋
yes, in never never land
2007-09-10 13:16:25 · answer #5 · answered by Anonymous · 0⤊ 3⤋