battery is hot. should i get rid of it>

[sigelitest]

I am running a 4082 2200kv motor and a 442 prop
On my DF 29 the battery is a 4000ma 4s pack

On a 6 to 7 min run the battery was hot/warm. I didn’t have my heat gun with me but It was slightly bulged. The motor and ESC were cool. The hull has turn fins, tabs and a stinger for a setup.

I am guessing the bat is shot

[Doby]

Whats the C rating of the pack....is it new or old.........6-7 minutes is a long run time for a 4000mah pack...do you have a meter that shows pack/cell capavity?

[sigelitest]

it is a 35c it charges at around 3700 the pack is about 6 months old
but i usually stop running it before i kill the battery all the way.
I wasnt on the throttle the whole time.

The pack swelled a little, but went back to shape after it cooled.
I have not noticed that before, but all my other packs are hard packs and I wouldn’t be able to tell anyway.
I just don’t like taking a chance with lipos

[eboat]

I bet it takes more than 3700 to charge it this time
(you should quite running when it would take 3200 to recharge)

[martin]

You should not take more than 80% out of the pack or you will cause damage if you havnt already to the battery.

[sigelitest]

the ESC cut out is set to 13.6 or 3.4 volt per cell

[eboat]

Your lipo got hot because you have over drained it if motor and esc were cool

[kendt]

Ya 7mins is way too long to push a pack. My 4400 mah packs never see longer than a 3-3/12 min run.

[sigelitest]

cell voltage range is around 3.34 and 3.35 is that ok
the only thing i can think is the ESC didn't shut down when it should have

[kendt]

Ya thats pushing it for lvc. Best not to rely on the esc's lvc. They are notoriously unreliable. I have had issues with them a few times and now I just turn them off and use a timer.

[iamandrew]

7Min is fine

To be honest, it could be something compleatly un related do the battery, motor and ESC.
I found that my batteries are cooler on my genesis now that i changed to the 150 to 3/16 single peice drive shaft

[eboat]

Have you tried to re charge the lipo yet ?
If it has shrunk back down I would try to recharge it
Just keep an eye on it when you do
Would be interesting to know how much it takes to get back to full charge

[sailr]

A typical 1 mile heat race takes 2-3 minutes tops. Anything longer than 5 minutes is really pushing the pack! I suspect the pack is just fine, you are just abusing it.