Will Charge voltage 4.235V demage my cell?

[bonmot]

After the charge gets into constant voltage mode, the voltage is 4.235V per cell. Do you have to lower it down to 4.200V?

[HPSOV2]

4.2 is the optimum yes, 4.235 is not dangerous but it may slightly shorten the batteries life.
How are you measuring this voltage?

[bonmot]

4.2 is the optimum yes, 4.235 is not dangerous but it may slightly shorten the batteries life.
How are you measuring this voltage?

When it is charging, measure the voltage directly on the cell. 4.235
After charging finished, unplug the battery, measure the voltage directly on the cell right away, still 4.235V

[redgiki]

Yeah, there's actually a small amount of wiggle room -- less than a tenth of a volt -- above 4.2v where you're not noticeably damaging your battery.

Better, though, to slightly undercharge to prolong your battery's overall cycle life. The fact is, you drop off that high-voltage shelf pretty quickly after the start of your run, and the rest of the discharge curve is quite flat until you hit the end-of-discharge voltage cliff. Why not only charge your batteries to 4.1v, plan for 70% discharge, and have a run with very consistent RPMs?

[WhirlingBladesOfDeath]

Someone will probably correct me, but I think it's also temperature dependent.

As the battery temp decreases, the max voltage drops too. 4.235 is probably fine at 70 degrees, but maybe not at 50 (for example). 4.2 was probably just a convenient number that lets you get down to 40 degrees or so (if I remember correctly).

HTH,
Jason

[Raydee]

What charger are you using? Have you hooked up a good DMM to see if that is indeed the true voltage? I had the exact same concern with my Hyperion charger and was told by the designer that the display voltage is off and should be fixed in the next firmware version.