About charger
Every NMH charger should have separate connection to thermistor probe
NMH charging is terminated based on detection of voltage increase and temp incrincrease
So charging without temp probe can be damaging to NMH cells
Yes voltage of Eplus hub can drop quite fast
ISOLATE Allen keys and screwdrivers with el tape except very tip before doing any job on the front hub!!!
Hope it is not too late
Again tell me
does you Eplus power up normally?