Voltage differance at end of charge OK? - RC Groups
Shop our Airplanes Products Drone Products Sales
Thread Tools
May 08, 2008, 08:13 PM
Registered User
flyboy320's Avatar

Voltage differance at end of charge OK?

When charging my Polyquest 2S 4000mah lipos, at first the voltage is the same, around 3.80v. At the end of the charge, and just before the Cellpro 4S goes into balance mode, the voltages of the two cell will be different, usually cell 1 will be 4.15v, and cell 2 will be 4.20v.

Is this difference of 0.05v at the end of the cycle something to be concerned about (the Cellpro always finishes them off at 4.20v each)? I also notice after some time, cell 1 will be less then 4.20v, maybe around 4.17v the next day, but the other one usually stays fairly close to 4.20v.
Sign up now
to remove ads between posts
May 08, 2008, 09:09 PM
Permanently Banned
that's becuz the pack is not fully charged , only a slow charge will stabilize the voltage
when the charge current goes down to zero @ 4.2V when using a regulated source and NO, U don't have to use a VOLTAGE CLAMP
May 08, 2008, 09:49 PM
Registered User
Hello Hall woo,

According to the article in this post, you will loose cycle life if you keep charging until the current drops to zero.

Don't you think it would be better to give up a little capacity in favor of cycle life?


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
BP gets hot at very end of charge?? lockheed martin Batteries and Chargers 51 Aug 17, 2005 08:21 PM
Will TP ProLite 2000 be charged end up at 4.26V and ok! jetkkman Batteries and Chargers 3 Jul 08, 2005 02:28 PM
APACHE 2500 end of charge Voltage per cell harvey Batteries and Chargers 5 Nov 10, 2004 12:59 PM
Hacker Master 40-3P shutdown at end of pack, voltage cutoff? MikeStammer Electric Heli Talk 2 Jun 11, 2004 10:30 PM
LiPo in Nokia cell phone - end-of-charge voltage? Danny Van Hoecke Batteries and Chargers 0 May 13, 2003 03:35 AM