I bought a dozen 38120's from Alarm Hookup and built a 4S1P test pack. All of the cells were around their nominal voltage of 3.2 volts. On the basis that they are fully charged at 3.7V (14.8V for the pack)I hooked up the balance and +- leads then plugged them in to a Hitec X4 charger and set the charger to LiFe. On the Hitec for LiFe 4S, thevoltage spec displays 13.2V which is the nominal voltage. The problem is that the Hitec reports a full charge and stops at ~13.7V. Also, one of the cells is about 200ma higher at 3.6V whereas the rest are around 3.40V. I have used the Hitec many times to charge 4S 18650 Lion packs and it charges the cells to 4.2V. The nominal voltage for 4S Lion on the Hitec is 14.8V.
Can anyone explain why the charger won't/doesn't charge the Headway LiFe cells to 3.7V each for a total of 14.8V?
Can anyone explain why the charger won't/doesn't charge the Headway LiFe cells to 3.7V each for a total of 14.8V?