Battery check - low voltage (Pb battery) - RC Groups
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Oct 26, 2010, 05:27 AM
Registered User

Battery check - low voltage (Pb battery)

Hi. I bought a pb battery yesterday and went to charge it today. I have a icharger 106B+ with a power master legends 40 amp psu. The battery is a PB 12 volt 12 AH. I entered PB program, set to 2.6 ampere (also 6 ampere with same result) at 12 volt power input, but i got this message: Battery check - low voltage.

Both voltmeter and charger says that the PB battery has currently a voltage of 10.61 volt. I use a male banana to banana plug from the charger.

This has not been an issue with my lipo's and nimh batteries.

What can be the problem? I even tried to set the input power at 12.7 volt with same result.
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Oct 26, 2010, 07:21 AM
Southern Pride
everydayflyer's Avatar
Both voltmeter and charger says that the PB battery has currently a voltage of 10.61 volt.
There is your trouble. Ypu purchased a stone dead, no good ,shot Pb battery.

When a 6 cell Pb is at 12.0 V is is empty and msute be recharged right now. Most sho;d never be discharge below a no l;oad voltage of around 1.4 volts.

There is as much to learn about Pb batteries as there is LiPolys.

Take it back , it is no good.

Oct 26, 2010, 07:29 AM
Registered User
flypaper 2's Avatar
That batt. is deader than dead. I'd take it back and ask for a replacement. 12 volts is considered dead after full use and in need of charge, using a good batt. If you can't return it, hook it up to a regular car charger that has no low voltage warning and leave it on till it shows over 12 volts, than switch it over to your more sophisticated charger and hopefully it might take a charge.
Oops, I must be a slow typer.
Oct 26, 2010, 08:31 AM
Space Coast USA
hoppy's Avatar
A fully discharged battery should recharged as soon as possible to keep the activity in the battery. A battery that is completely dead for more than 12 hours begins to sulfate itself and shorten its life. After 24 hours there is one full year of life lost in the battery.
See if you can find a battery charger (auto) that has a desulfating function, you may be able to save it if the vendor won't take it back.
Oct 26, 2010, 09:50 AM
Registered User
Thanks for all the answers! I'll take it back to the store and demand a new.
Oct 26, 2010, 11:18 AM
Registered User
Also, beware of charge rates. Most Pb batteries should not be charged at more than 0.1C, especially sealed units.
Oct 26, 2010, 03:00 PM
Registered User
Aha, so I should charge at 1,2 ampere then? This is a sealed battery. It is in a plastic container.
Oct 26, 2010, 04:44 PM
Registered User
Opick, yes 1.2 amperes max. The following site has some very good info on battery care including Pb.
Oct 26, 2010, 04:45 PM
Registered User
Awesome, i'll have a look at it. Thanks again!
Oct 27, 2010, 04:21 PM
Registered User
It's kinda charging slow. The battery has had 14.39 volt for a couple of hours now, and the ampere meter is at 0.31 - 0.33 A. It is still feeding mah's, but it's increasing slowly.

I have charged it with 1.0 ampere.

Is this the socalled float charging? Will it ever stop charging?
Oct 28, 2010, 12:26 AM
Frankenstein recycled packs
rampman's Avatar
Did you not listen to everydayflyer? That battery is on it's way out (the fuse is lit) so you should have taken it back. Its yours now.

Oct 28, 2010, 03:15 AM
Registered User
Oh, I forgot to tell that I got a new battery. It came with 12.15 volts.
Oct 28, 2010, 08:17 AM
Southern Pride
everydayflyer's Avatar
You keep buying dead / bad Pb batteries,. perhaps that one will last a little while.

You really need a true Deep Cycle and it really needs to be a fresh one.

Most flooded batteries should be charged at no more than the "C/8" rate for any sustained period. "C/8" is the battery capacity at the 20-hour rate divided by 8. For a 220 AH battery, this would equal 26 Amps. Gelled cells should be charged at no more than the C/20 rate, or 5% of their amp-hour capacity.
Last edited by everydayflyer; Oct 28, 2010 at 09:06 AM.

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