Right so my Riva (1100) arrived Monday and the charging instructions were quite complicated, charge for 8 hours use for 20 mins then charge another hour - I've got a full time job I've no time for that so just did what I suspect most newbs do charge whilst I learn how to fill, then vape, I did then charge the battery for the eight hours. Now that I have intial 8 hour charge out the way, what is the best way to charge ? Again the instructions were again quite precise charge for three hours even if the light goes green before that, but reading on here I've seen a few posts saying for optimum battery life don't wait till battery about to go charge when about 20% left but how do you even know when that is ? I'm thinking use one battery one day, charge it a couple of hours and use alternate then vape with charged battery and charge other for same time but don't use it again till following morning ? Would this be about right?