If you want 10 hours of battery life then you need to carry multiple charged 78mm Volt batteries, or 2+ batteries and a PCC (but don't screw up charging - I did enough to make me carry 2 complete ecigs with spare batteries for each AND a PCC), or have a charger(s) at work. Or use a PCC at work and vape off power. Or skip slim ecigs totally.
100mah is about 1 hour of moderate vaping, 1.5 hours of light vaping.
510 - 180 or 280mah
KR808D-1 - same as 510 but the Volt/Bloog still gives up .1 volt(3.6 instead of 3.7) in exchange for more charge of 220 (65mm battery) or 320mah (78mm battery for 120mm ecig) charge
Fat battery models like Ego and Riva 510 and others: 650mah+