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Unread 08-13-2013, 12:42 PM   #1
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Default Quick Battery Q

I have recently bought a volt meter to monitor the life of my batteries. They are at least 4yrs old and I would like some time to set back a little cash each month for when I do have to purchase new ones.

I am referencing the "State of Charge...." table that has been generously supllied by members. Last night I labled my batteries after approx 6hrs off the charger (Quick-Charge OBC) These are the readings I got, begining with the Pos side as 1 and 8 being the neg. This is a 48v system with ( 8 ) 6v Fullriver DC250-6 (250Ah)

(1) 6.54v
(2) 6.56v
(3) 6.53v
(4) 6.38v
(5) 6.38v
(6) 6.52v
(7) 6.55v
( 8 ) 6.56v

These all seem to be higher than the table reflects. Am I not letting it rest long enough after the charging process? Do these numbers look good to go? Any concerns with the 2 middle batts (6.38v). Should these be moved to other slots? Maybe switched with the higher v batts (2 & 8 )?

Many Thanks
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Unread 08-13-2013, 10:33 PM   #2
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Default Re: Quick Battery Q

Hopfully someone will chime in on this I also was in the upper range and this week my batterys are starting to drop down in the low 6.40's after 12 hrs of rest and a couple will stay around 6.48
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Unread 08-13-2013, 11:46 PM   #3
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Default Re: Quick Battery Q

I always rotated in pairs every six months. More often if I started seeing some imbalance going on. Where are the 2 extra six volts mounted - bagwell? What number are these?
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Unread 08-14-2013, 12:34 AM   #4
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Default Re: Quick Battery Q

Wait 12 hours before you check the readings. This will give you an accurate voltage measurement.
Do you have any accessories that run off of only two of the batts?
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Unread 08-14-2013, 10:55 AM   #5
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Default Re: Quick Battery Q

temppics.jpg

Jake, good point regarding the accessories, there is a red wire on #4 and a black wire on #5 (these are the two weaker batts). Have not traced them to the acc. yet.

Scooter, #4 & #5 are in the same compartment, but "scooted" back a little and harder to reach (See pic)

I took readings again last night. These numbers are after 36hrs from last charge and 3 or 4 miles of riding in fairly hilly but not rough terrain.

1)6.46v
2)6.47v
3)6.45v
4)6.30v
5)6.31v
6)6.43v
7)6.46v
8 )6.47

Can you goin into further detail of rotating in pairs?
Many Thanks
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Unread 08-14-2013, 11:50 AM   #6
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Default

Switch accessory wires to 6&7 then wait one month switch to 8&1 then wait one month switch to 2&3 then back to 4&5 this will help keep even strength over the entire pack. ,
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Unread 08-14-2013, 12:32 PM   #7
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Default Re: Quick Battery Q

Thanks Shaffer, that sounds much easier than moving the batts around. It would be a good time to trace those wires and determine which acc they power.
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Unread 08-14-2013, 12:52 PM   #8
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Default Re: Quick Battery Q

Did you have to make a bracket if some kind to fit those extra two batteries ?i wouldn't mind doing same thing with my extra two when I go 48v. Seems cleaner then having them in bag well.
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Unread 08-14-2013, 01:01 PM   #9
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Default Re: Quick Battery Q

Here's how I fit mine in, I bolted aluminum angle to the frame and trimmed some of the body for easier acsess
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Unread 08-14-2013, 01:03 PM   #10
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Default Re: Quick Battery Q

Don't know why but its only letting me upload 1 pic at a time
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