LIFE batt max cell voltage difference.

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Bill Eilers

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Mar 15, 2022
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Going thru one of the boats I Wana run. During a balance charge total voltage went to 8v. ( 2s pack) Stopped there. And then went thru another storage charge. To 75% .. cell 1- 3.312v #2 at 3.18v .. Any thoughts?
 
Had the same thing happen with a transmitter pack. It drop off real quick once under load to the standard 7V that I see out of it. Normally I dont see them go that high.
Mike
 
Going thru one of the boats I Wana run. During a balance charge total voltage went to 8v. ( 2s pack) Stopped there. And then went thru another storage charge. To 75% .. cell 1- 3.312v #2 at 3.18v .. Any thoughts?

Charger should never exceed 7.20 volt charge voltage for 2S LiFe.

Then they settle back to 6.66 to 6.68 or 3.33 to 3.34 per cell that would be 100% capacity within 15 minutes after coming off charger.
 
Are you sure you had your charger on LiFe? Not LiPo?
I did for sure. I did not even notice the voltage till it went in thetransmitter. It said it was overvoltage and would not turn on. It showed the voltage. It was beeping loudly. Which was dropping the voltage. Eventually I turned it off and back on so it was working. Then watched it drop from 7.6 to 7V in the matter of about 15 secs.
Mike
 
It is something strange they do when they fail but it has no amps to go with it. It tests that high but put a load and it falls out almost immediately.

The pack took a dump.

Some batteries have even reversed polarity when they fail but no oomph behind that change either but it will test reverse polarity.
 
It is something strange they do when they fail but it has no amps to go with it. It tests that high but put a load and it falls out almost immediately.

The pack took a dump.

Some batteries have even reversed polarity when they fail but no oomph behind that change either but it will test reverse polarity.
Daniel, I always test using a load which varies depending on the pack size and test over a fixed period of time.
 
Charger should never exceed 7.20 volt charge voltage for 2S LiFe.

Then they settle back to 6.66 to 6.68 or 3.33 to 3.34 per cell that would be 100% capacity within 15 minutes after coming off charger.

I have 5 boats and a buggy equipped with life at the reception and also at the transmitter 3s and that is exactly what Daniel describes
 
Had the same thing happen with a transmitter pack. It drop off real quick once under load to the standard 7V that I see out of it. Normally I dont see them go that high.
Mike
Sorry for the late reply. Put it thru another storage cycle. To 7.0 ran it today, 6 HARD turning laps. (Rod broke). Back home ballance charge came in at 7.1. 100%
 
Sorry for the late reply. Put it thru another storage cycle. To 7.0 ran it today, 6 HARD turning laps. (Rod broke). Back home ballance charge came in at 7.1. 100%

There is no way a properly functioning LiFe 2S is running those voltges.

I believe your volt meter is haywire or you would have to either have a LiPo or are charging it in LiPo mode.

Can we see pic of battery on the charger ?

LiFe charge to 7.20 and settle fully to nominal voltage of 6.66-6.68 volt. They do not retain top off charger voltage like a LiPo does.
 
There is no way a properly functioning LiFe 2S is running those voltges.

I believe your volt meter is haywire or you would have to either have a LiPo or are charging it in LiPo mode.

Can we see pic of battery on the charger ?

LiFe charge to 7.20 and settle fully to nominal voltage of 6.66-6.68 volt. They do not retain top off charger voltage like a LiPo does.
100% correct. I have packs I’ve been running for 3 years. 7-7.2 on the charge. Settle back to 6.6-6.7 and basically stay there for an entire day of running. Maybe they’ll drop off .1 or .2. They’ve always been balance charged. The resistance of each cell should be somewhat close in readings if you have a way of measuring that . My charger does this measurement. Somewhere between 40 ish and 60 ish normally per cell and they do vary a little depending on the pack. Correct me if I’m wrong but I think the higher the resistance gets, the weaker the battery is getting. For instance if you are getting up toward 100. Also if the resistance per cell varies more and more, you could have a cell going bad. Again, Correct me if I’m off base.
 
To think about it. All my batt come back around 95% (full day on a sat.(3-4 tanks) then ballance to 7.2 .. but Trans. Says 6.8 then quickly sets at 6.7 ..mid day 6.6 -- thanks for the reply
 
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