3) Decided to keep the functionality of the 36V battery rack, as my 36V battery still has some life in it, and installed the 48V battery rack on top. I had to remove the spring loaded top holder in order to do this. I spliced in the red positive and black negative so that the battery power will follow exactly the same route as the 36V battery. *I have not completed the mounting of the controller box - that is why it is hanging loose!*
4) Tested the 36V battery and immediately noticed that just fixing the controller made a huge difference. The acceleration is much better and smoother, and goes uphill much much better!
5) Tested the 48V battery (with the 36V battery still there, but switched OFF)...
Went to an empty deserted road on the low setting, which now goes up to 14mph. Once I got there, I tried medium power and that is now similar to the 36V high power setting and hit about 19mph... then... got ready, gritted my teeth, switched to High Power mode, held on tighter and opened the throttle...!!!
Basically this scared the crap outta me!! It managed to start raining just as I did this and on a very slight uphill (still with the weight of both batteries!) the bike was riding effortlessly (and it felt like it was still accelerating) at 24mph! I had to slow down as the rain was actually hurting from stinging my face and eyes!
Switched back to low power - I shall keep it here for riding on public roads anyway.
6) Thought about a few things... perhaps someone can advise me on this...
If I switch on both batteries at the same time, what would happen? They would essentially be connected in parallel, so would this result in a lower total voltage with increased range from higher Amp-hours?
Also, my 36V lights no longer work (with the 36v battery) - have I unintentionally damaged something on the controller? And if I do get them to work, could they still be used with the 48V battery?
And I am assuming that my battery indicator will work with the 36V battery, but not the 48V battery? Or will the 48V battery be drained all the way to below 35V before it shows low?
Thanks for all the advice on the forum, really helped me do this so far!