I purchased two of the Rad Runners for Xmas and both had the chain hop problem.  Rad sent me two new tensioners that have a slight different design to them.  First the spring tension using a small scale on the old ones measured about 1.5 lbs of tension where as the new ones read about 4 lbs of tension, much strong tension on the chain.
Second the mounting bolt is fixed and causes the angle of the tensioner to be at a different angle (more forward away from rear cog) causing the chain to be further around the rear cog and at a stronger tension and just like magic the chain skipping problem is solved.

I purchased two of the Rad Runners for Xmas and both had the chain hop problem.  Rad sent me two new tensioners that have a slight different design to them.  First the spring tension using a small scale on the old ones measured about 1.5 lbs of tension where as the new ones read about 4 lbs of tension, much strong tension on the chain.
Second the mounting bolt is fixed and causes the angle of the tensioner to be at a different angle (more forward away from rear gear) causing the chain to be further around the rear gear and at a stronger tension and just like magic the chain skipping problem is solved.

I don't think there is anything wrong with the batteries.  I have two rad mission batteries and one will cut off at 53.8v and the other always cuts off and 54.1 volts.  I think its more of an issue with the BMI circuit if anything and who knows Rad may have them made that way so they don't over stress the batteries on every charge which in the long run will probably make the batteries last longer.  Just my 2 cents.

Even though Rad saids they are not comparable can anyone see any reason why I can't put my Rad Runner 14 amp battery on my Rad mission bike to give me longer range.  They have the exact mounting tabs and electrical plug and both are 48 volt batteries .  Only difference is a extra row of cells for more capacity .