Battery Not Fully Charging

CaptainMG · Jul 8, 2015

Hey everyone, hopefully you can help me out. I have 3 TB47 batteries with my inspire. Recently, I've been having problems with one of them not fully charging. It stops at about 65%. So, I drained all 3 (first time bringing them below 8%) and the other two fully charged no sweat. But this one still stops at 65%. After it's reached that point, the 'LED 3' blinks 2 times per second, indicating 'over voltage charger protection'. Any idea what this means? I unplugged it, left it for more than 24 hours and tried again. No luck. Any help would be hugely appreciated.

Cheers,
Morgan

The Editor · Jul 8, 2015

CaptainMG said:
Hey everyone, hopefully you can help me out. I have 3 TB47 batteries with my inspire. Recently, I've been having problems with one of them not fully charging. It stops at about 65%. So, I drained all 3 (first time bringing them below 8%) and the other two fully charged no sweat. But this one still stops at 65%. After it's reached that point, the 'LED 3' blinks 2 times per second, indicating 'over voltage charger protection'. Any idea what this means? I unplugged it, left it for more than 24 hours and tried again. No luck. Any help would be hugely appreciated.

Cheers,
Morgan

Have you checked the individual cell voltages on the app?
What do they read when the pack is charged to 65%. Are they all around then same voltage?

CaptainMG · Jul 8, 2015

Battery 1 (the problem one): 65% Voltage: 25.7v, Remaining Power: 2880mHAH Total Capacity: 4500mAH Battery life: 100% Times Charged: 16
Battery 2: 100% Voltage: 25.8v, Remaining Power: 4455mHAH Total Capacity: 4500mAH Battery life: 100% Times Charged: 7
Battery 3: 100% Voltage: 25.9v, Remaining Power: 4500mHAH Total Capacity: 4500mAH Battery life: 100% Times Charged 8

The Editor · Jul 8, 2015

CaptainMG said:
Battery 1 (the problem one): 65% Voltage: 25.7v, Remaining Power: 2880mHAH Total Capacity: 4500mAH Battery life: 100% Times Charged: 16
Battery 2: 100% Voltage: 25.8v, Remaining Power: 4455mHAH Total Capacity: 4500mAH Battery life: 100% Times Charged: 7
Battery 3: 100% Voltage: 25.9v, Remaining Power: 4500mHAH Total Capacity: 4500mAH Battery life: 100% Times Charged 8

No - what are the INDIVIDUAL cell voltages on the problem battery?

Carlsberg · Jul 8, 2015

The Editor said:
No - what are the INDIVIDUAL cell voltages on the problem battery?

One thing we know from the overall voltage reported at 25.7, the pack isn't balanced anymore.

The Editor · Jul 8, 2015

Carlsberg said:
One thing we know from the overall voltage reported at 25.7, the pack isn't balanced anymore.

We do not know that at all!
6 cells at 4.29v per cell would show in the app as 25.7v (rounded 25.74v)

Carlsberg · Jul 8, 2015

The Editor said:
We do not know that at all!
6 cells at 4.29v per cell would show in the app as 25.7v (rounded 25.74v)

You are wrong about that my friend, but nice try

Kauaigene · Jul 8, 2015

Calling wrong without an explanation is not doing anyone any good.

Explain.

sirnikolas · Jul 8, 2015

Can you please provide us with a screen shot like the one I have attached of the said battery.
Thanks.

The Editor · Jul 9, 2015

Carlsberg said:
You are wrong about that my friend, but nice try

Would you like to explain why in your opinion I am wrong?
Two things to consider before you answer:
1. The app only shows pack voltage to one decimal place (although the individual cell graphic shows the cell voltage to two)
2. The Inspire lipos are not like 'normal' lipos in that they do not 'top out at 4.2v but rather 4.34v per cell when fully charged. If you take a look at sirnikolas screen shot above his pack is 100% charged at 4x4.30v and 2x4.29v = 25.78v but the app rounds it to 25.8v. The same as my explanation above. Would you consider his pack 'not balanced' because two cells differ by 10 millivolts each?

I noticed you made a similar style post in another thread with nothing to substantiate your argument. There is still no response from you with a plausible explanation to my post here (post #23)
http://www.inspirepilots.com/threads/tb47-tb48-deep-cycling.3804/page-2#post-44733

Perhaps you would be kind enough to bestow your knowledge on the subject to the community and we can all learn from your experience rather than just make comments like 'you are wrong'?

CaptainMG · Jul 9, 2015

sirnikolas said:
Can you please provide us with a screen shot like the one I have attached of the said battery.
Thanks.
View attachment 2692

Looks like the individual cells are not balanced. Is there a way to rectify this?

The Editor · Jul 9, 2015

CaptainMG said:
View attachment 2695

Looks like the individual cells are not balanced. Is there a way to rectify this?

Have you ever calibrated that pack?
Run it down to below 5% or ideally until it completely shuts off.
Allow it to cool then give it a full uninterrupted charge and check your cell voltages then.

CaptainMG · Jul 9, 2015

The Editor said:
Have you ever calibrated that pack?
Run it down to below 5% or ideally until it completely shuts off.
Allow it to cool then give it a full uninterrupted charge and check your cell voltages then.

I've got it down to 0% but never when it completely turns off. I'll give that a go now and report back. Thanks for the tip.

The Editor · Jul 9, 2015

CaptainMG said:
I've got it down to 0% but never when it completely turns off. I'll give that a go now and report back. Thanks for the tip.

Because your calibration/balance on the pack is out a reported 0% by the app may actually not be zero.
Take it all the way down until it shuts off, then recharge (after giving half hour or so to cool) and report back.

CaptainMG · Jul 9, 2015

I let the battery run out of juice until it powered off and would not turn back on. Let it cool for about an hour. Then charged it back up but it again stopped charging at 65% as the 'LED 3' blinked 2 times per second, indicating 'over voltage charger protection'. Here's a screen grab when I powered the craft back up after charging. Any thoughts to what's causing this?

The Editor · Jul 9, 2015

CaptainMG said:
I let the battery run out of juice until it powered off and would not turn back on. Let it cool for about an hour. Then charged it back up but it again stopped charging at 65% as the 'LED 3' blinked 2 times per second, indicating 'over voltage charger protection'. Here's a screen grab when I powered the craft back up after charging. Any thoughts to what's causing this?

View attachment 2697

It looks like you have a faulty pack.

I would return to dealer or RMA back to DJI.

chris digata · Mar 21, 2016

I knw this is an old thread.. but noticed that when an cell gets charged over 4.30 the protection kicks in.. was this battery charged with the dji charger or other?
and did dji say anymore on this..

royturbodiesel · Apr 11, 2020

This is a real old thread, but I'm trying anyway.
I experience the same problem.
I let the battery run out of juice until it powered off and would not turn back on.
Charged it again, but it stopped charging at 65% as the 'LED 3' flashes 2 times per second, indicating "over voltage charger protection".
I'm using the original charger, and this is a TB48 batteri, charged 14 times only.
Does anyone have a clue how to solve this?