It's a traxxas 2s 4000mah lipo and I got it for chrismas. when it is done charging the charger says 4.17v per cell
It normally says 4.2v per cell
What are your charger settings??
I have mine set to terminate the charge at 4.17... I only loose a few moments of run time yet will gain around double (or more) charge cycles from my packs.
Whatever it is I just typed... could be wrong.