Battery issue

[markymark6183]

Hi guys, I think I let my lipo's run down to much as I just gone to put them on charge now and the charger just beeps and flashes low voltage !! So basically they won't charge !!
Any tricks or tips I could try to try and charge up th e lipo's

Cheers
Mark

[Dr Fly]

essentially you need to get hold of a decent bench type power supply, and set the voltage a couple of volts above the pack voltage and then set a max current. Lipos will take quite a large current before anything goes wrong, but i would suggest something like 0.5A - 1A.

let the pack take some charge like this until the pack voltage has recovered enough to connect to your regular charger. Because you are current limiting the power supply, the voltage reading of the power supply should have dropped to show the pack voltage when you connect the battery.

The length of time to do this will depend on your battery capacity, and how deeply they have discharged, but you only need to get a bit of charge in to get your normal charger to play.

I have heard stories of people connecting packs very briefly to a large current or even a car battery, but i would not recommend this unless you really are desperate.

Hope this helps.

[markymark6183]

All sorted, I charged it on nim for a few mins to get some voltage in and then put it back to lipo !! Thank god

Thanks for the reply

[Dr Fly]

that would also work

hope they recover!

[Steve1973]

Worked for mine too! Cheers for the tip

[Clarkie]

Will this work for my 2s lipo one cell has 3v the other has 0v internal resistance of each cell is 300mohms and 0ohms

Any help appreciated or do I just bin it?

[ianjoyner]

Originally Posted by Clarkie

Will this work for my 2s lipo one cell has 3v the other has 0v internal resistance of each cell is 300mohms and 0ohms

Any help appreciated or do I just bin it?

Sounds like a connection problem on yours. Check your leads, or the problem may be internal to the pack.

[Dr Fly]

yeah, i would agree with a connection issue.

get a volt meter and check the total pack voltage using the main connector, then connect your negative volt meter probe to the negative wire and check the voltages on the balance lead, one should show 0v, one should be between 3v-4v and one should be between 6v-8v.

If its not a connection issue, i would not try and charge the pack, as one of your cells is well and truly dead.

[Clarkie]

Cheers fellas its not a connection issue as I can read 3.05V through the main connector so ill try Niamh charging that one cell

[i4n]

Originally Posted by Clarkie

Cheers fellas its not a connection issue as I can read 3.05V through the main connector so ill try Niamh charging that one cell

I'd do it outside, away from anything that will burn and stand upwind while you monitor it charging.........