tx lipo pack over discharged ?
 

I totaly forget to put my radio to off all the night and now my lipo is overdischarged I try to charge it and the charger always say too much low voltage what I can do for bring it to life ?

anyways I charged it on nimh mode to bring up the voltage to 9v ... it was at around 6v on the lipo... now I charge it in lipo mode and will see how much capacity im going to loose

Keep a eye on it, it might puff or worse !!

still take over 2600mah .. and top voltage are still 12.6v ...

I have discharged my tx lipo to 3v many times :lol: it puffs and then un-puffs when I charge it..

3v... 1v per cell and it still runs fine

:lol:

lucky guy, when it comes to lipos i do not take risks, im kinda paranoid about stuff like that.

i did that too, but its such a slow load that it never puffed. i just plugged it into my charger set it to nimh and then lipo and its fixed.
i have done this about 8 times :oops:

I have a Losi 14.8 4s 2200mah starter box battery that was discharged too much so this is very interesting. I would love to try and get this battery back in usable shape. I thought about trying this outside the house (duh)on a concrete pad but chickened out. How are you doing this? Just using a low setting for NIMH and putting some charge in it and then charging normally(lipo setting)?

Charge on NiMH @ 0.5 amps till the voltage comes up enough till the charger will acknowledge the lipo and charge on Lipo settings @ 1.0 amp closely monitoring for swelling etc. Check balance frequently and cross your fingers.
Hope you save it,not a cheap loss.

Thanks, I'm going to put the battery in a wheelbarrow with gravel in it and give it a shot. What's the worst than could happen......I'll post up the results.

No good.I've charged the battery a total of 1000mah @.5A on Nimh setting with my Ice charger. It will charge on Lipo settings @ 1A for about 30 seconds before warning that voltage is too low for the number of cells and shutting off.I don't want to push my luck and figure charging almost half the mah of the battery should be enough if it's coming back. I didn't actually pay for the battery but it was included in a trade so it still cost me something. Thanks for the help.

The voltage has to be at least 2.6 or higher per cell for the charger to reconize the lipo on the lipo charge setting.

I've got a Astro blinky and Equinox balancers and neither will fit the Losi balance plug so I need to pick a adapter up. I didn't see where the cells were voltage wise but after adding 1000mah back into the battery (a 2200mah battery)I would say it's not going to come back. I'll check it when I get an adapter for one of the balancers and go from there.

I think people are too careless with overcharged/overdischarged lipos. If it puffs or drops to a super low voltage get rid of it. Not worth risking burning down your house. The "it will never happen to me" attitude will eventually prove you wrong.

Nope. my Airtronics M8 handles it just fine.

I know the spektrum Dx3/2.0 can handle 3s fine also.

Yeah I actually edited my post because I remembered a lot of radios still take more than 4 AA cells. I'm just used to my Losi MTX Pro and Nomadio Sensor which both are only 4.8v-6v

Simplechamp-I did it outside my house in a wheelbarrow full of gravel away from everything but green grass. The battery is still there as I type this till tonight when I will discharge it and then dispose of it. Thanks for your concern though.

The battery in question was used for a starter box (14.8v 4s 2200mah) not my transmitter.

Depending what brand of TX, the Traxxas TQ3,JR XS3's, many others run on 8 AA's at 1.25v per cell = 10v. Going with a 3s is fine,I personally use a Voltage regulator to play safe.
The Spektrums like the DX3 S&R use 4 AA's and a 2s is usable but again to play it safe I use a Voltage regulator where many do not and have great success and no issues.

Losi and several other companys have a built in regulator right in the pack to determin safe voltage.

It would be nice if there was a stand alone voltage cutoff product for various applications.

I agree, like for starter boxes. I think I'm going to go for a gel cell 12v battery for this box but for now I still have another 14.8 4s 2200mah battery that works just fine. I just couldn't help trying again with the dead one and it is taking a charge today so maybe all is not lost yet......

Yesterday I charged the battery 1000mah on .5A nimh setting and when I tried to charge on lipo setting it would not charge (voltage too low)so I left it outside last night in a lipo sack and all day while at work. It was hot and sunny in the 90's. When I got home I decided to try one last time to see if it would charge on lipo setting.For some reason it started to charge all the way up to 14.8v with no puffing and the battery never got above room temperature, however after it was finished charging I watched the voltage dropping on the charger screen (ice) I don't remember ever seeing that before but it went down to 13.8v before I unplugged it. It's resting peacefully outside again tonight and after work tomorrow I'm thinking I might try to discharge it and maybe charge again and see what happens...

Unfortunately the Ice and others like it, most will not discharge more thn 1.0amp. Thats gonna be the test is the discharge. I agree to do what you've posted and just see what it's goona do ? Best of Luck.

My 2 Ice's will discharge at 8A. Is it different on the newer models? *Edit* Yep! The new models can handle 10A.... :smile:

A lipo should NOT do that. Once the CV stage begins, the voltage should stay "locked" at 4.2v/cell and the current should decrease until whatever the charger deems the end current to be. If the voltage is dropping during the CV stage, either something is wrong with the charger or pack.

The last time I looked at the charger(while charging) it was at 14.785v and 1300 or so mah, the alarm sounded and the screen said time exceeded or something, it had charged for 10800 sec. The charger was done charging when I noticed the voltage dropping. I'm pretty sure this battery is shot but I'm just trying something to see if it will work. I mean what can I do..ruin it? I'm doing this as safely as possible so at worst I let the smoke out and then I'll be sure this battery is done.

The final update is battery is no good. The battery has 3 "good" cells and 1 that won't even register on my balancer. #1 cell has 7.3V , #2 has 5.6 and #3 has 5.4V. How can this battery still be showing 14.3V on only 3 cells? In any case this battery is probably headed for the trash can. What's the safest way to discharge this battery?

A broom stick w/a nail in the end. Stand back and watch the show.

12 volt light bulb(s).

holy $*** One of teh cells is 7.3v?