icgns , i bought the Joye ego
batteries as advertised at MyVaporstore.com for 21.50 they are 1000mah with the 5 click on and off feature.
I have had these batteries since May of 2011 and never a problem with them i added another and i marked then 1 through 3 and rotate them .
I average 1 day of use on 1 and then it goes in the charger then put away until i use the other 2 .
So on average each battery gets charged every 3 days.
When battery is in use and needs a charge it will indicate it by a bunch of flashes on the button and will no longer work until charged.
I always carry an extra with me when im out and about.
As a note i also use the LR Atty and it give a very nice hit indeed better than the regular .
The site has a video if you are handy on how to make the atomizer last longer by cleaning them.