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08-31-2017, 01:33 PM | #1 |
Not Yet Wild
Join Date: Sep 2013
Location: Louisiana
Posts: 46
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How to charge dead batteries?
I have an RXV with a 6x8v setup. The cart got left off the charger for a while, and now the SOC has dropped too low for the stock charger to work (2 red blinks). My SOC meter was reading around 17v.
I have a Stanley Fatmax charger that has a voltage selector for 6, 8, 12, 24, 36, and 48. I've tried connecting it to the full pack and selecting 48, but it doesn't seem to recognize it. I've tried a couple of single batteries set at 8, and the fault LED will blink while the charge LED is lit, but it will go switch to ready after a short period of time. Is there a way to recharge a battery that is down to 2 or 3 vaults, or did I kill my batteries and need to replace them? |
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08-31-2017, 02:38 PM | #2 |
Gone Wild
Join Date: Mar 2014
Location: NE Indiana & SW Florida
Posts: 3,235
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Re: How to charge dead batteries?
Put it on 8v setting and charge one battery at a time for one half hour. When done see if golf cart charger will turn on. If that doesn't work do another round. Do this till the golf cart charger takes over. You don't have to unhook any cables to do this.
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08-31-2017, 03:24 PM | #3 |
Gone Wild
Join Date: Jun 2017
Location: NC
Posts: 368
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Re: How to charge dead batteries?
Your going to have to get an old school charger that doesn't have any advanced "smart" features.
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08-31-2017, 03:48 PM | #4 |
Gone Wild
Join Date: Apr 2015
Location: NorCal
Posts: 718
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Re: How to charge dead batteries?
As a last resort, you might try charging each 8V battery with the charger set on 6V. This will lower the turn on threshold for the charger. If they are still good, the voltage will come up to about 6.2 and then the cart charger might recognize the pack.
But, if you did not destroy them completely, you reduced their life a lot. |
08-31-2017, 04:25 PM | #5 |
Not Yet Wild
Join Date: Sep 2013
Location: Louisiana
Posts: 46
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Re: How to charge dead batteries?
I can't get it to charge doing a single battery. Can I do 2 batteries at a time set to 8v?
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08-31-2017, 04:30 PM | #6 |
Gone Wild
Join Date: Sep 2012
Location: Charlotte, NC
Posts: 9,329
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Re: How to charge dead batteries?
Plug your multi-voltage charger back on the entire pack and set it for 24v.
Once that is done, leave it connected to the pack and set it to 36v. Once that is done, leave it connected to the pack and set it for 48v. You can charge any number of batteries together (Ie: 2 batteries on the 6v or 8v setting) as long as the batteries are not internally shorted. |
08-31-2017, 09:01 PM | #7 |
Gone Wild
Join Date: Aug 2017
Location: Archdale NC
Posts: 201
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Re: How to charge dead batteries?
Edited.. Now editing back. With 12v deep cycle batteries like for my camper, if they fall to a low soc a charger will not charge them back. But if you hook a set of jumper cables to it and leave it for a while then it will charge from the charger. Not sure about a 48v system but like Sergio suggested maybe try charging two or three at a time with jumper cables. Somebody block me if it's not recommended. But due to amperage I'm not sure if you will get feedback to the 12v vehicle.
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08-31-2017, 09:11 PM | #8 |
Gone Wild
Join Date: Sep 2012
Location: Charlotte, NC
Posts: 9,329
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Re: How to charge dead batteries?
If Your charger is "too smart" to even try, You can do like Whitaker suggested and connect a 12v jumper to 3 batteries at the time.
Do both halves then connect 2 batteries at the time to the 12v jumper. That may get them to where the smart charger will work. Edit: Remember to always make the last connection on the +12v battery side as there could be a lot of hydrogen gas around the fast charging 8v batteries and you don't want to add a spark. Last edited by Sergio; 08-31-2017 at 09:21 PM.. Reason: Safety reminder. |
09-01-2017, 08:18 PM | #9 | |
Gone Wild
Join Date: Jan 2014
Location: South Georgia
Posts: 1,120
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Re: How to charge dead batteries?
Quote:
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09-02-2017, 04:14 PM | #10 |
Not Yet Wild
Join Date: Aug 2017
Posts: 5
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Re: How to charge dead batteries?
That is some serious over-discharge.
I hate to be the bearer of bad news, but your best move is to replace the batteries. |
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