Recently converted my 2008 brushed motor model EVT-4000e from spent SLA's to lithiums with excellent results! Thanks to a slightly higher pack voltage and straight across discharge profile, the scooter has much more power and keeps that power over the entire discharge cycle. Have not checked it with GPS but the speedometer says I picked up roughly 10 mph top end and range has almost doubled as well. The conversion included a 40ah 16-cell pack, a full BMS system, intelligent charger, over/under power relay shutdown and a 2-1/2 inch LED pack status monitor on the dash. To top it all off I converted the headlight, all turn signals and the taillight to low-power LED bulbs. When this was done, I removed the tacky front and rear turn signals (that always seemed to get knocked off) and used the internal front and rear turn signal housings. The result was much lower power drain and a cleaner look. Lastly, the scooter weight dropped by 90 pounds. Purchased the pack, BMS computer and a DC to DC converter from Elite Power Solutions in Phoenix. The LED bulbs & small display were purchased on eBay. Except for that display on the scooter console, it all looks pretty much standard. However, the performance improvement is nothing short of awesome! Next on my list are two new Michelin S1 tires and then I'll have a completely new scooter! Not posting complete details of the conversion since it appears no one is riding this scooter anymore. However, the pictures below pretty much chronicle the conversion process. If anyone has questions, feel free to contact me. Happy riding!