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Unread 11-30-2011, 02:47 PM   #1
Gone Wild
Join Date: Nov 2011
Posts: 173
Default 2009 Precedent 12V battery warranty -additional info

I thought I'd start a new thread in case someone wants to see some actual measured battery data. I wanted to make sure I had a battery problem before paying for a service/warranty visit from the dealer.

Here's the info:
ambient temp : 63
battery voltage fully charged : 50.4
individual cells : 12.6/12.6/12.5/12.5 ( per the book this is approx 90% of full capacity )

I drove the cart with pedal to the metal to see how long it would take for the amber dash light to illuminate steadily. I never thought it would take so long!

The light came on steadily after 1:40 of full throttle on fairly level roads.

After waiting for about 5 minutes I measured the voltages.
battery voltage : 46.2
individual cells : 11.6/11.7/11.6/11.7 ( approx 25 % of full capacity )

According to Trojan's specs a new T-1275 battery should be able to deliver the following ( not sure at what temp these numbers apply )
102 minutes at 56 amps
280 minutes at 25 amps

The motor in the Club Car is 3.1 hp which equates to 2.3 Kw.
48V x 48A = 2.3 Kw. The fact that the numbers are the same is a coincidence.

When you interpolate between the 102 and 280 minute ratings ( although it is not linear in an actual battery ) you get 130 minutes (2:10) at 48 amps.

Club Car says that when the light come on steady you should have about 30 minutes of battery life remaining until it is fully discharged. The 1:40 that I actually got plus :30 is 2:10.

The battery light came on when there was 25% capacity remaining which is actually what the book says.

So much for my original theory that I had a bad battery. I was amazed that the actual numbers came out virtually identical to the predictions, and that the battery light came on with 25% capacity remaining.
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