LiPo Charging Parameters

[pesky badger]

A question for the LiPo boffs.

I've got a ProTrak charger that is LiPo compatable. It allows for the user to specify the voltage at which it changes from constant current (CC) charging to constant voltage (CV) charging. What do the main chargers have this set at, and with what cut-off amp draw? The ProTrak site has the figures 8.4v (to go from CC to CV) and 2A to stop the charge. I'm presuming these are fine but has anyone got any problems with them?

Ta

[chris_dono]

4.2v per cell is peak voltage, so 8.4v for a 2S pack

What amps you use is dependant on the capacity and recommended charge rate for the battery itself, but 1C (5amps for a 5000maH battery, 3.8 for a 3800 etc) is a good setting to use.

I've not seen any setting on when to stop the charge (other chargers, not the pro-trak) so can't help with that bit, sorry

[MiCk B.]

Hey,

I use the following settings when charging lipos on a protrak.

Cut off of 0.5 amps and change over voltage of 8.2v for the pack.

(I regard the 8.4 as a max setting!)

Seems to work for me.

MiCk B. :-)

[pesky badger]

Thanks for that.

I'll try your settings once I get some packs.

[discostu]

Originally Posted by chris_dono

4.2v per cell is peak voltage, so 8.4v for a 2S pack

What amps you use is dependant on the capacity and recommended charge rate for the battery itself, but 1C (5amps for a 5000maH battery, 3.8 for a 3800 etc) is a good setting to use.

I've not seen any setting on when to stop the charge (other chargers, not the pro-trak) so can't help with that bit, sorry

hey chris

just charge`them at full current 5amps to 8.4v it wont harm them.

stu

[chris_dono]

hey stu, long time no speak, where you been hiding ?

[discostu]

Originally Posted by chris_dono

hey stu, long time no speak, where you been hiding ?

hey bud ive not been hiding just racing off road got fed up with the tc racing at epr on the 22nd you comming down.

stu

[ads0021]

For all this worry about Lipo batteries and the dangers of using them, has anyone seen one blow up? And if so was it miss use or just random.

[Col]

Originally Posted by discostu

just charge`them at full current 5amps to 8.4v it wont harm them.

Originally Posted by ads0021

For all this worry about Lipo batteries and the dangers of using them, has anyone seen one blow up? And if so was it miss use or just random.

If the above pack are smaller in capacity - ie 3600mah - then keep your eyes in that direction.There are vids on youtube of lipo's exploding. Most are down to mis-use (overcharging...) Newer cells are much better

[Chequered Flag Racing]

Originally Posted by pesky badger

A question for the LiPo boffs.

I've got a ProTrak charger that is LiPo compatable. It allows for the user to specify the voltage at which it changes from constant current (CC) charging to constant voltage (CV) charging. What do the main chargers have this set at, and with what cut-off amp draw? The ProTrak site has the figures 8.4v (to go from CC to CV) and 2A to stop the charge. I'm presuming these are fine but has anyone got any problems with them?

Ta

Have been using the Orion Avionics charger and it drops to 0.2a of there abouts before charge stops. Voltage would appear to be pre set as there's no way to change it. Have my Pro-Trak set to 8.4v and stop at 0.5a and it works fine. Software is 11.13v. Not sure why but it allows voltage cutt off to be 9.8v for 2 cell and half that for 1 cell. Only thing I can think of is it left over from when they were setting up the sofware as we're advised not to over volt lipo's on charge

[pesky badger]

Thanks for the replies. Now another ProTrak question (and I can't remember what software version it is, but it's after 11) - can you change the charged / welcome tones on it as I can't find that option (could do it on the earlier ones)? The dulcet tones of a slightly off key 'Pink Panther' are doing my sweed in