I usually recommend manual batteries (easier to get a good hit and that model's manuals are fully sealed on the end so as safe as possibly from being damaged or killed by juice leaks).
SmokelessImage is offering some new design leak-resistant auto batteries for people to try out but I did not see any kits yet with those.
These are all compatible with each other - Bloogplanet Maxxfusion, SmokelessImage Volt, Halocigs G6
And they can also use the cartos from vapor4Life (the more original style of KR808D-1 - Vapor4Life model is more like the original manufacturer style of KR808D-1 and V4L claims a custom longer safety cutoff on these - you can take up to a 10 second drag vs 5 second for the others like G6 and Volt. The V4L manuals still have a hole but it looks like it is sealed inside). With Vapor4Life WOW cartos I recommend a plastic or delrin drip tip as a mouthpiece (top coil, hotter vapor, bigger hit, but less easy drag)
And for any - I do not recommend the short/65mm batteries because as soon as you try one standard/78mm one (makes 120mm ecig) you will realize you want the longer charge all the time.