Careful! Lipo Fires Are Real!!!!

[Probedude]

Originally Posted by Fedor

Thanks a lot .I got my self the UH lipoguard.Yeah it also seemed to me littlebit bizzare that you should use some lipoguard and on same time ventilate.Because the lipogurad blocs tha gases.
Thanx

No it doesn't. These bags are meant to contain the heat and flame but they need to vent. Pressure build up is not a good thing.

[Mark Wood]

Originally Posted by Probedude

No it doesn't. These bags are meant to contain the heat and flame but they need to vent. Pressure build up is not a good thing.

The vent on our LipoSack is designed to vent smoke and gases but prevent flaming debris from being thrown about ground zero.
Is there a vent on the UH copy? I haven't seen one.

mw

[Probedude]

Originally Posted by Mark Wood

The vent on our LipoSack is designed to vent smoke and gases but prevent flaming debris from being thrown about ground zero.
Is there a vent on the UH copy? I haven't seen one.

mw

My comment was about lipo sacks in general and his misunderstanding of what they are supposed to accomplish. They all vent because none are gas tight.

Where is the vent designed into your sack? Somewhere other than the flap region?

[flyin C]

Originally Posted by Probedude

Eventually it will, though mine really settles around 1.2C. How long do you let it charge for before stopping it from the charge being too high?

What capacity was the last lipo you charged to completion on the Cellpro?

Dave

i was charging a 3s 2100 battery before at 2 amps, unplugged the charger to reset the settings, and started charging my 2s 900. It was on the charger for 4-5 min. It went from 31% to 64% in that time!!!

[Mark Wood]

Originally Posted by Probedude

Somewhere other than the flap region?

That's where the two 2" vents are. I've seen copies without a vent. Probably pretty hard on the closure system in an ignition.

mw

[Probedude]

Originally Posted by flyin C

i was charging a 3s 2100 battery before at 2 amps, unplugged the charger to reset the settings, and started charging my 2s 900. It was on the charger for 4-5 min. It went from 31% to 64% in that time!!!

Ahhh! That's why! The Cellpro remembers the last pack you charged to completion and starts the next pack off at that value. Again it should only do this for the first few minutes, maybe up to 5 - I don't know for sure, before figuring out "Hey, that's too much!" and start lowering the charge current.

[Dave Hederich]

Mark, maybe the geniuses who copied your design figured your safety vent was a flaw that needed to be corrected.

[Mark Wood]

Darned seamsters. I'm gonna have to talk to them about those missing seams.

mw

[flyin C]

Originally Posted by Probedude

Ahhh! That's why! The Cellpro remembers the last pack you charged to completion and starts the next pack off at that value. Again it should only do this for the first few minutes, maybe up to 5 - I don't know for sure, before figuring out "Hey, that's too much!" and start lowering the charge current.

I charged the same battery last time and today. I put it at 1C, so it should be charging at .90amps, since its a 2s 900mah battery, but it charges at .99-1amp?? Am I going to harm my battery?

It was not a full charge, just from 83% so it only charged at that rate for a few minutes, until the low amp, ''balancing cells'' charge starts.

[rampman]

.99-1A is fine. Only 10% over what the standard is at 1C but many charge at 2C with newer pack technology.

Rick
www.CommonSenseRC.com

[Probedude]

As Rick said, you're fine.
The Cellpro doesn't know what capacity battery you hooked up (it can't read the label). It can only calculate what the capacity should be based on the rate of voltage rise over time and at a given current. Mine overall at the 1.0C charge setting settles in at about 1.2C.

Don't worry about it!

[pilotpete2]

As Probedude said, the Cellpro uses a "dynamic" charge rate.
The last time I checked out those stone tablets that some guy with a white beard carried down from the mountain, there was no entry that stated "Thou shalt not charge lipos at over 1C"
Pete

[Probedude]

Originally Posted by pilotpete2

The last time I checked out those stone tablets that some guy with a white beard carried down from the mountain, there was no entry that stated "Thou shalt not charge lipos at over 1C"
Pete

It was on the 3rd tablet that he dropped one the way down from the mountain! (Moses looked suspiciously like Mel Brooks. . . .)

[flyin C]

Cellpro 4s....

I charged at 1c on my 2s 900mah battery, but it only charges at around .50-.60 amps?? Am I doing something wrong??

[Probedude]

Originally Posted by flyin C

Cellpro 4s....

I charged at 1c on my 2s 900mah battery, but it only charges at around .50-.60 amps?? Am I doing something wrong??

All the way to the end of the charge it only did 0.5-0.6?
What was the state of charge of the pack when you first put it on?