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Old 05-30-2013, 06:56 PM   #1
brownchristian
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Default Battery Health

I have been trying to charge my batteries for a week now and I just took readings immediately after I took them off the charger.

Each battery was 6.4 - 6.5 and the total was 39.5.

This seems higher than the 100% chart. When should I be testing them?
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Old 05-30-2013, 07:00 PM   #2
3WheelDumbo
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Default Re: Battery Health

Let them rest for about 12hours after charged.... at least that's what the guru's say here and they haven't steered me wrong yet
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Old 05-30-2013, 08:08 PM   #3
crash test dummy
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Default Re: Battery Health

yea dumbo is right !!!

there is a first time for everything
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Old 05-31-2013, 06:32 AM   #4
brownchristian
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Default Re: Battery Health

Ok. Let them sit overnight.

Each battery measured 6.2 - 6.3 volts and the total measured 37.9 volts which doesn't make sense.

Each battery is 70% from the chart but the total is in the 90% range. What does this mean?
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Old 05-31-2013, 07:37 AM   #5
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Default Re: Battery Health

If you're using a DVM, try setting your meter to a lower scale (something like 20 V.). That will allow your individual battery measurements to be to two (2) decimal places (example - 6.31 volts). That should make the sum of your individual readings come closer to the total pack reading. - RAY
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Old 05-31-2013, 07:51 AM   #6
3WheelDumbo
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Default Re: Battery Health

Quote:
Originally Posted by crash test dummy View Post
yea dumbo is right !!!

there is a first time for everything
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Old 05-31-2013, 09:10 AM   #7
scottyb
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Default Re: Battery Health

Your readings are disappointingly low. SOC readings are taken 12-24hours after the charge. The charge should take the pack up to 44-46v (36v) or 58-63v (48v) then the pack settles and you see how much of that the batteries can hold after 12-24hours of just sitting. This will give you a sense of what percentage they are good for.
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Old 05-31-2013, 09:42 AM   #8
brownchristian
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Default Re: Battery Health

Batteries are 6 years old so I know they have problems. Just want to know how bad they really are.
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Old 05-31-2013, 10:52 AM   #9
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Default Re: Battery Health

37.9v on 6 year old batteries is good .. but they are declining ... start saving
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