bought 2 new batteries for my mobility pride scooter, 12 V U1AGM 35AMP BATLIQ1017..... INSTALLED THEM TODAY and before charging them they tested at 12.7 v.. put the scooter charger on and both batteries showed 13.4 v,. my question..... the charger has been on for about 5 hrs now and the charger still shows red light on which means they are not fully charged yet... i tested the batteries and one showed 15.2 and the other 14.8..... i unplugged the charger for now because i am not sure if they are to much charged.. is it normal for new batteries to show a reading so high even though the pride charger says they are not fully charged yet?? should i plug the charger in again tomorrow and continue to charge until the charger shows green like it usually does????? thanks for any advise..

12.7 V at rest IS fully charged. And 14.8-15.2 IS too high of voltage for an AGM battery. Something is wrong.

An AGM full charge resting voltage may be a little higher than 12.7V. Most are around 12.8V, with some like the Optima at 13.1V. The charger for your scooter is supposed to produce 29.6V while charging. That’s 14.8V per battery. Seems likely you have a charger problem, though having two batteries in series showing different voltages after charging with a single charger would also indicate some difference in the batteries that bears watching.

Do you have the mfg specs? Depending upon the mfg, etc up to 15.0V for charging might be OK but it does seem high. 0.4V difference seems significant. Are the batteries connected in series?Call Pride and get a technical person, not some sales person. Also battery quality can and does vary so that might be a factor. Expect pushback if you use a different battery source.

Charging raises the battery voltage and they can maintain that for some time, it's know as surface charge. Use the scooter a little or let the sit overnight and the voltage should drop to the 12.7V range.

They need to be "Equalized" how to do that on your system I do not know. I know how I'd do it but it requires hooking them in parallel to a DIFFERENT charger.

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wa8yxm
Explorer III
Jun 12, 2022
They need to be "Equalized" how to do that on your system I do not know. I know how I'd do it but it requires hooking them in parallel to a DIFFERENT charger.
CA_Traveler
Explorer III
Jun 12, 2022
Charging raises the battery voltage and they can maintain that for some time, it's know as surface charge. Use the scooter a little or let the sit overnight and the voltage should drop to the 12.7V range.
CA_Traveler
Explorer III
Jun 12, 2022
Do you have the mfg specs? Depending upon the mfg, etc up to 15.0V for charging might be OK but it does seem high. 0.4V difference seems significant. Are the batteries connected in series?

Call Pride and get a technical person, not some sales person. Also battery quality can and does vary so that might be a factor. Expect pushback if you use a different battery source.
jkwilson
Explorer III
Jun 12, 2022
An AGM full charge resting voltage may be a little higher than 12.7V. Most are around 12.8V, with some like the Optima at 13.1V. The charger for your scooter is supposed to produce 29.6V while charging. That’s 14.8V per battery. Seems likely you have a charger problem, though having two batteries in series showing different voltages after charging with a single charger would also indicate some difference in the batteries that bears watching.
Grit_dog
Navigator
Jun 12, 2022
12.7 V at rest IS fully charged.
And 14.8-15.2 IS too high of voltage for an AGM battery.
Something is wrong.

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