RE: E-Flight battery not charging.
I've had several e-flite packs (mostly for blade series).
Do you only charge with the stock balance-charger from e-flite? or Do you have access to any LiPo charger?
Got a volt meter?
You probably have one of the balance tab voltage missing, so the charger will not charge it.
Check the output voltage from the power lead. Record it.
Check the voltage from Black-Red, It should be equal to the above. If not youneed to move theRed balance wire on the boarddirectly to thecell-3 positive tab (Red power wire attached to it) <<< I usually had this probelm.
Check the voltage from Black-Blue, and Black-Yellow. <<< these for other cell voltages.
Most of the problems on the pack that has the full voltage out of the power lead, but not on the balance port is that small IC in the pack is bad.
Check the 4 voltages. Then, if one of above shows. Do it carefully. All those fixed packs still works fine.
If you need help, let me know with 4 voltages. I will try to explain step by step.