Your best bet with a non balance lipo, is to keep the charge rate at exactly or a bit below 1c,
or 1.5 amps on your kokams. Also keep the current draw within reason, and after a flight
wait for the battery to fully cool down before recharge. The more heat the pack builds
the more out of balance the center cell on a 3 cell will become, this happens because the
cell in the center can't cool as well as the outer 2. also a good rule of thumb is to only use
about 80% of the packs capacity to give it a good long life.