Motor Vehicle Maintenance & Repair Hello it's my first time here and I will try to address the issue as best as I can. I left my keys in the ignition a few days back and hence my battery drained itself. It is a 12V maintainence-free battery and I want to charge it enough for just one crank. I found a 16v 1.5A adapter and 12V 4A adapter. They are probably old laptop chargers. Could I use anyone of them to charge it? I have been reading up about it and have seen cases where the wires have melted due to overheating and there are chances of explosion too. Normally a 14V adapter would be ideal but 12V or 16V should work too right? But I am worried about the Amperage since a heavy current will fast charge and damage the battery. Personally I feel the 12V 4A adapter might not be able to charge the battery that efficiently,since a multimeter reading shows the battery to be at 11V and a 4A current might be too high. So the 16V seems like a better option. Plus my multimeter's Amperage measurement is damaged so I have no way to take current reading when connecting the battery to the 16V adapter.

But could I connect them without a resistance since the current is only 1.4A and constantly check for overheating? I just need enough for one crank and the battery is new, not even a year old with no corrosions on the terminals or leakage. Sorry if this was too long and thanks for any help/advice. PS: I really want to charge it on my own and understand there are risks involved. I'm planning to make a proper battery charger on my own in future, but for now I lack the technicalities involved. Your 12v adapter would only be able to raise the battery voltage to 12v, but to charge a car battery fully you would need to raise the voltage to 13.8v. The 16v adapter would raise the voltage too high and could cause damage. A 4A maximum current would be fine and would not cause any damage, but you need a 13.8v source. Batteries like NiCd need an accurate constant current to charge them, lead acid batteries (e.g. car batteries) need an accurate constant voltage to charge them. Did you find this question interesting?

Sign up for our newsletter and get our top new questions delivered to your inbox (). I'll preface this by saying, I don't think using a laptop adapter to charge a car battery is the way to go. If it's your only means to get it done, do it at your own risk ... that said: If you can get your battery back to 12v using the 12v adapter, it should be enough to get your motor started. Then the alternator can take over and recharge the rest of the way. I had a battery in my truck going bad for some time. When I finally took it out to change it, it read a little over 10vdc, yet it was still able to start my truck (albeit the starter was complaining about it). Point is, 12vdc should be adequate to get the vehicle started. 13.1vdc at the battery is optimal (fully charged battery at rest), but 12vdc should get the job done. Ensure you don't have any extraneous power draws going on when you do this (ie: radio, lights, door open, etc). This will take away from the batteries ability to get the vehicle started.

I did not hook my battery up with the 16V charger as I felt the risk would be too much (its a pretty new battery will update if I try it though).Vinyl Floor Drain Cover With the 12V charger things worked fine. Weed Plants Touching LightI did not find any heating in the adapter or the battery. Reviews For Safe Step Walk In TubsThe adapter just got mildly warm when the voltage reached close to 12V. The first time I charged my battery for nearly 3 hours, did get a crank which was better than the state I found my battery in, but not enough to start the car engine. Next day I charged it continuously for 6 hours and it worked. I wouldnt recommend charging this way but, its a nice handy trick to have in case you need it someday.

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