Battery Charged backwards - Fiberglass RV


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Old 06-04-2013, 08:55 PM   #1
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Battery Charged backwards

Can you undo a charging mistake?
Like hooking the charger to the battery backwards?
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Old 06-04-2013, 09:19 PM   #2
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Did it explode?
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Old 06-04-2013, 09:21 PM   #3
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Nope. lol
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Old 06-04-2013, 09:43 PM   #4
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What kind of battery, how many amps, how long attached? Do you get a voltage reading with a meter connected to it correctly?

Rich
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Old 06-04-2013, 09:50 PM   #5
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Yeah so what happened? Is there a problem? Is the battery holding a charge? How old is the battery?
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Old 06-04-2013, 09:50 PM   #6
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Quote:
Originally Posted by carlkeigley View Post
Can you undo a charging mistake?
Like hooking the charger to the battery backwards?
You might check for blown fuse but other than that I have seen this a dozen times since Scamp uses black and white instead of red and black wires.
On a Scamp there is an inline fuse, Hopefully the same is true in your case.
Just replace the fuse and correct the polarity at the battery and things usually return to normal. Check the battery after a few hours to see if it is accepting a charge.
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Old 06-04-2013, 10:14 PM   #7
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Depending on the charger, but for instance, a Deltran battery tender, like I use for my motorcylce batteries, have reverse polarity protection. So if you hook it up backwards, the chearger sees that, and does not even attempt to charge it.
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Old 06-05-2013, 08:45 AM   #8
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Those warning labels are only for the company that sells them anyway. (Joke)
You do know if you charge your battery backwards everything will go backwards. Even the bulbs will suck all the lite of the camper. (joke)

Guy next door tried to jump start his BMW with the p to the n and I caught him before it blew. I think you are lucky, maybe the inline fuse helped you out. Why don't you take your battery to be tested at the part store? Might be time for a new one any how.
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Old 06-05-2013, 09:10 AM   #9
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If you reverse charged the battery, you can try draining it completely, then recharging at the right polarity. It might be scrap, but it is worth a try.
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Old 06-05-2013, 10:03 AM   #10
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If it is dead you could try a low trickle charge to the battery to see if it comes back. I drained an optima red top dead to absolute zero and trickle charged. I'm still using it 5 plus years later. It's at least from 2005 when I bought it. Point is batteries can take some abuse and if you are careful how you recharge them they might surprise you. I'm curious what it would due to a battery now. I'd be potentially more concerned about the charger and any electronics that might be have seen the reverse voltage. Though any positive voltage in the battery may have canceled it out at least in the equipments eyes. I'm not sure if reverse polarity would cause an over current but fuses only pop when excess current flows they don't know polarity.

Rich
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Old 06-05-2013, 11:54 AM   #11
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Think I got lucky this time.

Actually, it's the battery on my mower.
It's a new battery. Seems my batteries don't stay charged.
May have to have my charging systems checked out. I had
trickled charged (2amp) for a few hours. When it would only
click I knew something was wrong. Then I noticed I had hooked
the cables up backwards (again). The previous battery had a
bad cell so it needed replaced anyway. I recharged it at 10amp.
When I went out after dark last night, the mower started back up.
I haven't checked it today, we got more heavy rain. I was going
to finish with my commercial mower and the battery was dead on it
as well. After realizing what I did, I double checked my commercial
mower. Luckily I had it hooked up right [with my old charger]. It's
the new charger I keep hooking up backwards. (2X). Need to mark
the cables extra ways.

My blood pressure had dropped in the low 90's so may have impaired me.
Blood sugar down to 77 at one point. Maybe I should have wife finish mowing....LOL

Anyway. Being an ex-mower repairman you think this wouldn't happen.
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Old 06-05-2013, 12:09 PM   #12
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Why?
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Old 06-05-2013, 01:42 PM   #13
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I took my post off because the other person did too
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Old 06-05-2013, 01:45 PM   #14
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Quote:
Originally Posted by carlkeigley View Post
T
Anyway. Being an ex-mower repairman you think this wouldn't happen.
LOL Carl there are lots of things that happen as I age that one would think shouldnt! The frequency of some of it is scary actually!!
Perhaps its time to label the battery to remember - I recently put a sticker on my trailers battery box regarding correct hook up as a reminder to myself and anyone else who happens to remove the battery.
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