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Unread 10-30-2018, 07:39 AM   #1
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Default always a voltage issue

Past couple months i have been keeping the cart on the back burner being i have got into another hobbie .. 1/10 scale Rc crawling lol

Have had a few issues to attend to, had to get a new battery being it had a hole rubbed in it, had to get a new wire from the controller to the vglide since it looked rough, and stuck a new brush on the vglide cause well it was old.. problem im having is the pack just dosnt seem like its where it needs to be. i can still get the 20mph out of it but something isnt right

At WOT after a full charge i remember my meter being at 48.6 wide open flat out.. now it is 1v shy of that at 47.6.. i have gone through and cleaned all the battery ends, wire wheeled them and dielectric greased everything and it wont come back to where it was.. I have my big manual charger i stick on till hit hits 63 volts and then unplug it.. then ill set my maintainer on and it floats at about 53.6 im wondering if i just have to run that new battery through the loops again to make it even?

I had some corrosion on the battery cable ends which took off the protective coating and im gonna cut the ends off and make them good again also with heat shrink this time.. Sad thing is my buddy hooked me up with this aerospace 1/0 wire and i dont want to mess it up lol

any other ideas would be appriciated.. I need to get a battery meter turkey baster thing and see if they are all the same to i beleive? put them on the meter last night and they were all between 6.31 and 6.34

Thanks again guys for any input
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Unread 10-30-2018, 08:45 AM   #2
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Default Re: always a voltage issue

It looks like You are not charging Your batteries properly.

The correct Lead Acid charging algorithm will keep the batteries around 57v while in the "absorption" phase, the quick "bulk" mode you are using is only good to charge them to about 80%.

Maintainers and float chargers only charge the battery plate surface and eventually will corrode the bottom of the plates due to stratification of the electrolyte.
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Unread 10-30-2018, 09:00 AM   #3
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Default Re: always a voltage issue

so i need a new charger that can do all of it is what youre telling me ..

i have a picture of my big charger that doesnt have a cut off

and then https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

this is the one i keep on when im not home
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Unread 10-30-2018, 10:14 AM   #4
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Default Re: always a voltage issue

Actually that old big charger is a Ferroresonant charger and it should taper the current around the 57v mark and slowly go up to the 63v you reported.

Do the batteries act weak right after you unplug the big charger or only after it has been on the smaller one for a while?
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Unread 10-30-2018, 10:20 AM   #5
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Default Re: always a voltage issue

The cart has plenty of power after either charger is on it, it just wont hold the voltage when under a load .. cart can sit for 12 hours after either charger is on and come back to 51 volts but it used to be 52 ... and now like i said its short the 1 volt while under a full load ..think maybe the corrosion has trickled past a cable lug and got into the wire?
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Unread 10-30-2018, 04:25 PM   #6
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Default Re: always a voltage issue

Here's what happened to me. Draw your own conclusions. My carts voltmeter used to consistently read in the 46.x volt range.(on the biggest hill I go up) After I upgraded to #2 wire it dropped down into the 45.x volt range. In my reasoning bigger cable allowed it to draw more current. More current equals more voltage drop. To me that's normal. My 2.
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Unread 10-31-2018, 06:58 AM   #7
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Default Re: always a voltage issue

i would agree with you on that but the difference didnt happen after i changed wires.. it just happened out of no where.. thats what is throwing me for a loop
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Unread 10-31-2018, 09:19 AM   #8
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Default Re: always a voltage issue

How long did the cart sit? You may be able to cycle the batteries a few times and get them to come back, or run that big charger on it for another couple hours to try to desulfate the plates.

I would agree that a new smart charger would serve you better in the long run. Those maintainers really don't do any actual charging of the pack. They just keep it fresh for an extended time after a charge. I don't think your pack has ever really had a full complete charge using that method.
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Unread 10-31-2018, 09:44 AM   #9
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Default Re: always a voltage issue

i know they bubble like crazy when my charger gets up to 63 volts.. ill let it sit go back to 54ish and then put the little charger up and itll bring it up to about 58 and start bubbling again.. Id really like to know if they were fully charged.. Really wish someone local had a charger i could barrow lol
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Unread 10-31-2018, 09:55 AM   #10
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Default Re: always a voltage issue

Are You saying the Lestronic charger is not stopping by itself?

It should automatically stop if the timer circuit is working properly.

Next time You charge and the voltage is up to to 63v, measure each individual battery (while still charging) using a meter set for 2 decimal places of precision (20v scale if not auto).

You want to make sure all batteries are close to the same voltage.
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