I guess I'm not understanding what it is you'd like to do with it. If perhaps you'd like it to shut off right at 3800 then a capacity setting of 4256 could be used.
The capacity cut-off is merely a "safety stop" or a "backup" and should not be used normally. The peak detection (mv value) is what is normal for stopping charge. It is set as a "per cell" value so set it to 5 mv.
ps I happened to be chargeing a 6 x 3800 nimh and the stop code is C.2 when the capacity stop has been reached. Your particular battery might just hold more than 3800 mah and if so it is a good one.
