100mah is about 1 hour of moderate
vaping
small slim
batteries are 180mah
somewhat long slim batteries are 280mah (like KR808D01 standard and Joye Mega XL)
Standard DSE901 batterys are 180mah but I think there are longer 280mah ones available
VaporKings.com "White Diamond" gloss black battery - crystal tip with white LED
Or you may be able to use a normal standard 280mah size KR808D-1 battery and I recommedn manual - $10 at LiteCigUSA.net or the prettier ones are a bit more at Vapor4Life.com (check the sales categories too - they may still have some standard 280mah or XL 380mah batteries - the XLs are really long and do not fit in any KR8 PCC)
For more charge than that you need to buy fat battery 901/KR808D-1 stuff like the PigCig at LeCig, or the Ego-like but KR8/901 threaded Elegant Easy at CigEasy, or the more popular Riva 901 at Liberty-Flights (press the 20% off in upper left of front page first) - all of these have 650mah+ of battery life.