Glad it worked in a real life scenario
Make sure you register it with RavPower on their web site.
I bought a RavPower multiport USB charger that failed, and they immediately just posted out a replacement not requiring a return.
...I later discovered it had not actually failed but it was one of the USB leads that had shorted out causing the charger to shutdown.
I connected them, but they just said 'don't worry about it' and didn't want me to return the replacement.
I guess such customer service has resulted in increased sales, by me posted this thread originally.