Mooch's Recommended 21700-size Batteries
Samsung 21700 40T 4000mAh 25 amp CDR
Molicel 21700 4000mAh
30 amp CDR
(best all around 21700, a bit wider in diameter than other 21700's)
Samsung 21700 30T 3000 mah
35 amp CDR
(highest amp rating for a 2100)
Samsung 21700 50E2 5000 mah
10 amp CDR
(highest capacity 21700, but only 10A, must have "2" on third line of battery)
Mooch's Recommended 20700-size Batteries
Sanyo 20700 NCR2070C 3500 mah
30 amp CDR
Sanyo 20700 20700B 4000mAh
15 amp CDR
(best if used under 10A and under 30 watts)
Molicel INR20700A 2800mAh
30 amp CDR