The battery you buy will depend on the mod you are using and the amps you need. From a safety standpoint never charge batteries when you are not around to monitor them. Never leave them charging when you are sleeping.
18650 Batteries
1. Orbtronic SX30 2100mah 30A
2. Sony VTC4 2100mah 30A (there are no new stock authentic VTC5's out there)
3. Xtar 2100mah 30A (re-wrapped Sony VTC4)
1. AW 1600mah 24A
2. Orbtronic SX22 2000mah 22A
3. LG HE2 2500mah 20A
4. Samsung 25R 2500mah 20A
5. AW 2200mah 20A (new)
Battery Basics for Mods: IMR or Protected ICR?
* Another essential read to understand which batteries are safe to use in mechanical and regulated mods. Includes a frequently updated list of recommended safe-chemistry, high-drain batteries with their specifications.
Purple Efest Batteries not as Advertised
* A cautionary blog that reveals that the purple Efest batteries may not have the specifications advertised. Also includes a commentary on "continuous discharge ratings" vs "pulse discharge ratings" of battery specs.
Where to Get Batteries
Only buy batteries from a reputable supplier (not ebay or Amazon) as there are many counterfeit batteries being sold. Here are several reputable battery suppliers in the US.
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RTD Vapor
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Illumination Supply
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Lighthound
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Orbtronics