What a well thought out, written and documented review
I was chompin' at the bits to read your review....well done and over the top!!!
Congratulations
You might like to get a small legal pad with holder to create a log:
date ....miles ....... volts .......... amps
....... start stop total start stop rest out in
This will help you see how your battery pack is doing over time.
Check to see if the Delta Q charger has a bluetooth app for your phone/tablet.
My Eagle Pro does and provides a great deal of data which I use for my log.
As I re-read your review over ..will contrast compare your notes with my I40
and chat further along..
Thanks for such a well done report