I installed a Bafang BBS02 with a Whale Shark (48volt 20.3AH) battery with a DPC-18 display on my Bacchetta Corsa. I reprogrammed the controller using different ideas from other riders. I did set the Low Battery Protection at 41 volts and Current limits at 18. After reprogramming the bike is just fantastic to ride with the factory setting it was very jerky and kinda scary at some low speeds. At other times didn't even know that it was doing anything. Took the bike out to test the battery, run it down and see when it would cut off. Garmin said I did 72.4 miles with 1774ft of climbing at a moving speed average of 19.8. Near the end of the ride I was riding around 28-29 mph try to use up some battery. Around mile 69 the battery was reading 45 volts jumping down to 44.9. The little battery on the display beside the voltage was almost all black with just a little white showing. Then it shut off, the display went dark, everything off. Rode the next 3 miles back to the car without power. I'm very very pleased with Baffang kit and the battery never expected the speed (had it doing 38.4 on flat ground with 80% power) it has nor the range of the battery. Just curious why did the battery shut down at 45volts,was it the controller or does the battery have so type of protection? Thanks I have enjoyed reading everyone's post I'm new to the e-bike world.