I've had my Radrunner Plus for two years and 5000 miles.  Two weeks ago the motor started making funny noises, then before I could take it in to a shop, it failed. 

The shop is quoting me $1507 for repairs (see attachment)!  That's almost the price of a new Radrunner Plus!  Of special note is the $250 in labor alone for installing the controller...is installing the controller really that complicated?  Or are these people ripping me off?

Second question: Is it normal for an e-bike to be ready for the junkyard after only 5000 miles?  It's not like I've been abusing it:
1. I've used it solely for commuting to work
2. Commute is pan flat except for one underpass where I descend about 15 feet, then ascend.
3. My total load is about 260 lbs.
4. Weather is mild year-round (central California coast)
5. I always ride with power-assist 5 but never use the throttle except for the first 2-3 seconds coming out of a stop.
6. I never ride in the rain or leave the bike out in the rain

If I have to junk it I'm definitely never buying a Radpower product again.

Thank you, crorris!  Your top link's product worked: https://amzn.to/42L7q0Q It's a little loose but so far hasn't popped out while riding.  I used a cable tie to keep it handy per the photo.

Thanks, but it's the little black round rubber one that seals where the charging cable attaches.  It's attached to the battery via a rubber flap. 

This is the small black rubber plug that you insert into the charging port after you disconnect your charger on a Radrunner Plus (I assume most/all Radpower bikes are the same).  Mine split in two.  Now if my e-bike is ever in the rain, the battery may short. 

I just spent about twenty minutes looking for one of these on line but can't find one anywhere. 

Any ideas?