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If you have any ego 56 volt batteries that are dead or not taking a charge it's most probably because one or few of the 18 650 batteries inside might have undercharged. They either are going to show 0.00 volts or less than 3.0 volts, which is their minimum voltage. To charge or complete their functions their minimum charge is 3.0 and Max full charge would be at 4.2. I connected a working 56v Ego battery in parallel to the other non-working batteries to give the cells inside a jump start high enough to be able to connect to their charger.