The mhc777 doesn't charge lithium-ion batteries. The charger you want is
the mhc777+. I have one and it works well with the Kenwood stock battery.
I think that Maha has an updated charger to the 777+. I suggest giving them
a call at 1-800-376-9992. I hope this helps.
Dave Marthouse N2AAM [log in to unmask]