This is really great information, thank you! I also have the RY48140. My SLA batteries have some life left but I've been preparing for the eventual conversion. Your success with the Chins as a drop in replacement is great news. I'll definitely be considering that battery and the charger you...
Right now the Chins 48V battery that seems to work as a drop in solution is 15% off with a lightning deal on Amazon, stackable with the usual $70 off coupon.
https://a.co/d/9OWbDqv
I'm thinking about getting this, but I'm also thinking about this alternative from Enjoybot. Seems to have...