I have a hyosung GT250R, Its about 8 months old and the battery has gone flat from not being ridden about a 3 weeks. I can't run start the bike, that best I managed was a slight turn of the engine no were near enough to get it started. I thought about jump starting it, but my cables are a bit broken. While trying to repair the jumper cables I found a car battery charing thing. I checked the spec's in the user manual and it seems to be ok for 12V with 7Ah- 120Ah, the YTX14-BS battery in the hyosung is a 12V/12Ah. It does however say to charge only Lead Acid battery's, Are these lead acid? I also spoke to my dad about this, and he said the battery should have holes where water can be added and which will allow gas to escape when its being charged. It me it seems the battery is sealed, and says "DO NOT OPEN". Does anyone know if these battery's can be charged?