mcristiani wrote:Thanks Fetcher. Settling back down to 4.23 after charger has been off for 5mins.
Am I crazy though. If I put my little 5v charger on the single cell using the two sense wires on either side of it, doesn't that only charge that one group/series?
Yes, it only charges that group. Because the sense wires are small, there will be a voltage drop in the wire as the charger is running. This voltage drop will add to your observed reading, depending on how the wires run.
Ideally you want to measure voltage directly on the cell can without going through any wires, but this is not practical in many cases. As long as there is no charge or discharge current, the voltage drop in the sense wires will be zero and the reading will be accurate.
4.23v is a little hot. Don't go over 4.2v. Most people don't even go that high for routine charging. To balance the pack, taking it to 4.2v is good since that's where the BMS starts to kick in.