Yesterday when picking up a new Bulls Six50 E2 Street I was unable to set the bike into any assist modes, and the headlight wouldn't come on. The mechanic and I thought this was because the battery wasn't charged, so he loaned me the battery from their demo Six50 and everything worked OK during the test ride. This morning, after a full 12 hour charge, the battery lights show full but the bike won't go into assist modes and the headlight doesn't come on. It's almost like the bike doesn't like that particular battery. I tried calling the office in Lynwood CA (number found at http://www.whitepages.com/business/bulls-bikes-usa-lynwood-ca-2) and was told Tech Support is OOO until later today. Hoping that @BULLSBarney or @Adam@BULLSeBIKES is watching threads and can help, or someone on this forum can offer a suggestion.