I bought my 510 at TW. I have the mega titan batteries(90mm long) , and of course 3 is not enough (I burn through them pretty quickly), but I am not sure If I should switch to the riva batteries given I would need a new charger or adapter. (and why do you need a cone?) Anyway I went on TW and their titan mega bat. is 13.99 280 Mah. On eastmall the 510 mega (I can't tell if it is the reg. length or long.) is 380 mah and cignot has 510 extended life that is 1" longer than the reg. battery and has 280 mah and is $16.00. It seems that the cignot and TW batteries are the same. And the reason for all of these questions is that I am going CAMPING with the relatives and I don't want any chance of running low. (and I am not going to bring reg. cigs) Advice? clarifications?