Getting confused.I am waiting for these two purchases, to be delivered.Do I need anything else?.I'm thinking of the controller.That i have seen,in a bag on some bikes.Thanks in advance,Because if I do need something else,I better be ordering one.https://www.ebay.co.uk/itm/36V-15Ah-Hailong-lithium-li-ion-e-bike-battery-2A-charger-New-slim-style/283856333667?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649 https://www.ebay.co.uk/itm/EU-Duty-Free-TSDZ2-pswpower-36V350W-Central-Mid-Drive-Motor-Conversion-Ebike-Kit/253714878359?ssPageName=STRK:MEBIDX:IT&var=554234234207&_trksid=p2057872.m2749.l2649