lipos & voltage...

[alad61]

After reading Trouts issues with his lipo's. I thought I'd confir with the masses... I have found that when I charge up my lipo packs for my seaview on my "smart" charger making sure the capacity is correct. They end up with an average of 8.6v in them. Which I understand a fairly normal for most rechargable batteries. Now when I power up the sd with the recharged pack the motors start ramping up into full throttle with no input from the tx... So as an experiment I used the charge unit to discharge them to around 7.8v & found that they don't have the same result. Something else I will try is to reduce the input capacity to 1200 milliamps after this w/end.

Is this common thing or am I just "lucky"?

[He Who Shall Not Be Named]

New to me, Alec. Kevin?

David

[KevinMc]

Hi Alec,

Something sounds off here - A 2 cell LiPo should not read more than 8.4V fully charged. (I know that last 0.2V doesn't seem like much, but when talking LiPos I've always been told that 4.2V/cell is the max you should ever charge to.)

What charger are you using? Does the "capacity" setting affect how much charge goes in or only the initial charge rate?

[alad61]

G'day Kevin,

It is a Powertech plus model MB3632. It is fully programmable for lipo's, Nicds & Nimh and even Pb lead acid batteries. I can set the capacity, nubmer of cells and voltage. Then charge the packs on either a charge mode or balance mode. I tried it on the week end with the battery I had in the 3rd sea trials run at the lake . Only this time I reset the capacity to 1.2 instead of 1.3 and it came up flashing between 8.4-8.5. I don't reckon the .1 drop in capacity is going to make that much difference in run time but it will be a couple off weeks till I get a chance to do another sea trial to be sure.