Battery diagnosis - 2004 ezgo 36 volt series cart

kdeerman

Hey guys,
I bought a $3.50 specific gravity tester for my batteries and measured the voltage. The results are below. Could Doug or someone tell me if I need to replace any, or do anything else?
The readings were in the 'fair' range on the tester except for cell 3 of battery #3, which read 'replace'.
Thanks, Kenny

Battery 1 - 6.36 V
Cell 1 - 1.210
Cell 2 - 1.225
Cell 3 - 1.230

Battery 2 - 6.41 V
Cell 1 - 1.257
Cell 1 - 1.226
Cell 3 - 1.247

Battery 3 - 6.32 V
Cell 1 - 1.250
Cell 2 - 1.250
Cell 3 - 1.100

Battery 4 - 6.38 V
Cell 1 - 1.225
Cell 2 - 1.245
Cell 3 - 1.227

Battery 5 - 6.40 V
Cell 1 - 1.250
Cell 2 - 1.250
Cell 3 - 1.250

Battery 6 - 6.40 V
Cell 1 - 1.250
Cell 2 - 1.248
Cell 3 - 1.248

BGW

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sunking

Battery 3 is toast, and the spread on the others indicate they need equalized. If these are Trojan batteries they need Equalized when the SPG falls below 1.250 or ranging more than .030 points. Throwing out battery 3 your range spread from the highest 1.257 to the lowest 1.21 = .047

Without knowing the temperature of the cells and assuming they are between 70 and 80 degrees all of them are undercharged. !00% SOC would be 1.277 at 75 degrees.

FWIW battery 1, 2, and 4 are not in real good shape, you will know more if you equalize them, battery 3 is toast (cell 3 is just about water only), batter 5 and 6 look OK for now other than slightly under charged.

mikesmotortoys

Are they the original batteries? All your readings are nice, but there is only one true way to test batteries and that's with a discharge machine. If you're having charging / run time issues, then it will be time to replace the entire set...

kdeerman

This test was done after a full charge. I am using a new delta-q charger vs. the Powerwise charger I have. I'm not sure how old the batts are, just bought the cart 6 months ago. The brand is Golf Pro 220. The outside temp during the test was around 50 degrees F. How do you 'equalize' batteries?


[QUOTE: FWIW battery 1, 2, and 4 are not in real good shape, you will know more if you equalize them, battery 3 is toast (cell 3 is just about water only), batter 5 and 6 look OK for now other than slightly under charged.]

Test was done after a full charge. Should I replace # 3, or replace the entire set?
Thanks.

scottyb

Um, how long after the charger turned off was the test taken?

kdeerman

Charger turned off sometime during the night, test was done around 9 am.

FIXEROFCARTS

What do you use the cart for? How much do you use it at a time? Do you go5 miles or 20 miles?

scottyb

Hard to tell how many hours the batteries had to settle down to some real numbers then? My point was you will get falsely high voltage and SG #s within 12 hours or of charging.... the settled readings are more true

sunking

Al of them.

kdeerman

Preferably 20 miles, but realistically 5 or so, but up & down steep inclines.