Lipo Voltages

[Chris Briggs]

Just a quick one chaps, what is the maximum voltage for a 2S lipo - is it 8.2 or 8.4V? The instructions I got with the battery say 8.4V (or 4.2 / cell) but when i charge, the charger stops at 8.2V.

Its a new charger and pack (my first Lipo) so I presume everything is ok, just wondering why the difference.

Ta
Chris

[MikeS]

Should be 8.4v for 2S LiPo. Check the battery voltage with a volt meter to see what that says, then check the chargers configuration as many support different cell type and it might be wrong.

[Chris Briggs]

Mike

Thanks for the reply, the pack is at 8.2V after charging - checked on a digital multimeter. The charger is set for LIPO but I cant find any setting to adjust the ultimate pack voltage - you select 1,2,3,4,5S pack type. I am sure it wont affect me too much - I am only running stock brushless and aint very good even at that. I was just curious and wondered if 8.2V was standard and 8.4V was the limit.

i will have another look tonight to see if i can find a hidden setting!

Regards
Chris

[Dez82]

Hi Chris, 8.4V is the maximum, not a target, and some budget LiPo chargers only charge a 2S LiPo to 8.2V to give the cheaper LiPo cells a longer working life, so it might just be that.
Some more expensive and accurate chargers have a cold weather balance that reduces the cell voltage to accomodate the LiPo technologies hate of cold temperatures, so it might be that.
What charger are you using by the way?

[Chris Briggs]

Dez - ha, your email makes sense when you as the make.... I guess you hit the nail on the head, it is a "budget LiPo Charger" but I will have another look at it tonight, it may be a setting I am missing or something like it is limiting the voltage due to the balance lead being plugged in. Your mention of 8.4V being a maximum kind of answers my question, I am not one for pushing things to the limit all the time anyway!

[MikeS]

Question:

...what is the maximum voltage for a 2S lipo...

Answer:

Should be 8.4v for 2S LiPo.

:

[Chris Briggs]

Sorry Mike I did note you said 8.4V as well!

[KeithA]

My guess is that your charger is in Li-ion mode instead of Li-Po mode.

Max charge voltage for Li-Po will probably be 4.2V but for Li-ion it could possibly be 4.1V, so that stacks up with your 8.2V reading.

[MikeS]

.....then check the chargers configuration as many support different cell type and it might be wrong.

:

[Mark Christopher]

dont worry mike, i saw what you put so did not reply LOL

[Chris Briggs]

DAM DAM DAM you are all correct! despite me being positive it said LI-Po, it did, when I turned it back on, in fact say LI-Io

My mistake, I hang my head in shame and vow never to be an idiot again.

Thanks for your help guys, I await your replies giving me appropriate slagging.


Chris

[PDW]

My mistake, I hang my head in shame and vow never to be an idiot again.

Chris

Damn - you shouldn't promise what life will make sure you can't deliver!! Glad it's sorted...