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Started By
Message
Golf cart battery help
Posted on 10/9/20 at 3:25 am
Posted on 10/9/20 at 3:25 am
I have 5 good batteries and one drops down to 7v when under a load while the rest are 7.75-8v when under an 80% load. Has anyone had any licj with using a trickle charger to bring a battery back to life. The battery reads full voltage when it is fully charged and not under a load its only when under a load that it drops.
10
Posted on 10/9/20 at 4:40 am to Lsu111519
You don’t have good batteries.Voltage is too low especially the one reading 7v.
Posted on 10/9/20 at 4:59 am to Sebastian
Yes but do you think a trickle charge would bring it back to where it needs to be.
Posted on 10/9/20 at 5:14 am to Lsu111519
Drain them and add some water back.
Posted on 10/9/20 at 5:21 am to Lsu111519
Probably be better to replace them all at the same time.
Posted on 10/9/20 at 5:29 am to Lsu111519
quote:
bring a battery back to life.
Not sure what you’re wanting to accomplish here but a trickle charger won’t bring a battery “back to life”. Batteries, and the plates within, have a life span. I’m assuming these are 4 cell, 8v batteries. A battery in good condition should be 2.1v per cell, or in your case, 8.4 total, at rest. Is your one low battery below the others even at rest? If it is, it’s acting as a load to the remaining batteries. It will drag the others down until they reach the same potential, which is usually at or near the voltage of the lowest battery. This is a load, no different than leaving the lights on etc. I would check all cells of all batteries with a hydrometer. This will identify the culprit. And, depending on the age of the battery set, don’t replace just one. Install a fresh set.
Posted on 10/9/20 at 6:09 am to Croozin2
At rest it reads the same as the others. Under load it drops about more than the others drop under load. The cart runs about 46v instead of 48 v
I ran a multimeter on it while driving and I know which one is bad
I ran a multimeter on it while driving and I know which one is bad
This post was edited on 10/9/20 at 6:14 am
Posted on 10/9/20 at 6:15 am to Lsu111519
At rest voltage is meaningless.
Posted on 10/9/20 at 6:15 am to Lsu111519
I would check specific gravity of all cells with a hydrometer and go with the results you find. Can get them cheap at any auto parts store. Autozone may even let you borrow one.
Posted on 10/9/20 at 6:25 am to Lsu111519
They make a desulfating charger for deep cycle battery’s. The eat up the chelation (scales) that build at the bottom the cells. You can Google it better than I can explain it to you.
But you probably could replace that 6v battery cheaply. Change one and change the others as needed. Unless money is no object.
But you probably could replace that 6v battery cheaply. Change one and change the others as needed. Unless money is no object.
Posted on 10/9/20 at 6:27 am to Lsu111519
one of the cells is corroded in the questionable battery. replace it or it will slowly ruin the other batteries.
Posted on 10/9/20 at 6:38 am to BHM
Incorrect. You want to charge them fully and then take them off the charge and let them rest for a cpl hrs then test them.
If one is low it will stop the others from fully charging and will drag them down like the poster above said.
You can try charging just that one battery if you have a stand alone charger to try to get it up to the other batteries.
It may be toast. You really shouldn’t replace just one in the set because the others will drag down the new one.
If your looking to replace them take a look at roypow lithium batteries. Cost more but comes with a list of advantages that make it worth it imo.
If one is low it will stop the others from fully charging and will drag them down like the poster above said.
You can try charging just that one battery if you have a stand alone charger to try to get it up to the other batteries.
It may be toast. You really shouldn’t replace just one in the set because the others will drag down the new one.
If your looking to replace them take a look at roypow lithium batteries. Cost more but comes with a list of advantages that make it worth it imo.
Posted on 10/9/20 at 6:46 am to arcalades
If I can't find a used one couldn't I just buy a new one and it should last 6 months or so. No point in buying all new now if I can get 6 months out of just buying 1 battery or do you think it won't last long. O would like it to last to spring but I also won't drive it much in the winter.
Posted on 10/9/20 at 7:52 am to Lsu111519
I always get the butler to do this so I don't know.
Posted on 10/9/20 at 8:02 am to Lsu111519
Can you get just one to make it last, yes. It won’t last as long as it should but if you are just trying to get a little more time before buying new it will work. I’d still get a new full set when it’s time and ditch the one new one you want to get now.
How old are the batteries? Do you check and add water as needed?
How old are the batteries? Do you check and add water as needed?
Posted on 10/9/20 at 8:08 am to NOLAGT
2.5 years old. I always add water every few weeks but sometimes my wife has driven it without water. I'll likely buy a cheap new one just to make it until the spring and buy brand new
Posted on 10/9/20 at 8:10 am to Lsu111519
quote:
Yes but do you think a trickle charge would bring it back to where it needs to be.
No. Try a heavy max charge to shock them. Disconnect them all together and charge each one at the time. That might help. Your batteries have a lot of plating that is blocking them from being charge.
Posted on 10/9/20 at 8:14 am to fishfighter
Explain what you mean by heavy max charge and what I use to do that
This post was edited on 10/9/20 at 8:15 am
Posted on 10/9/20 at 8:16 am to Lsu111519
Switching to lithium ion was the best thing I ever did. I don’t miss the days of fricking with those batteries
Posted on 10/9/20 at 8:18 am to Lsu111519
Trickle charger is designed to prevent discharging and is not like a charger that is designed to restore a battery to charging specs, depending on the condition of cells and electrolyte.
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