AW IMR 18650's are the recommended batts for 3.7v's because they can handle the high current demands that low resistance attys require. The AW protected batts are used with great success by many. The only bad thing that could happen is the protection circuit "could" be tripped due to the current being near the max allowed by the protected version. The ONLY other batts that are worth using for 3.7v imho are the "Redilast" protected batts. They are actually made from the same basic Panasonic cells that AW uses for their batts.
For 5v the NI-MH 4.8v 600mah batts are the only real choice. They require a special charger. They work awesome with 2Ω-3Ω attys and cartos.
For 6v 2x Lifepo4 3v-3.2v batts are the most common used. AW make lifepo4's as well that offer great performance too.
All can be found at various vendors. My personal vendor of choice is Randy at RTD Vapers. He's a REOnaut, knows what awesome customer service means, and what will work or not work with the reos. His prices are great too. As far as chargers, there are several that will charge the 3.7v batts. The best being the high dollar Pila's. A great charger that will efficiently charge all the 3.7v batts out, as well as the 3v lifepo4's (with a slide of the voltage selector switch) is the UltraFire WF-188.
Here's some links to the items mentioned above...
AW IMR 18650
4.8V NiMH 600mah Battery (This requires this charger listed next)
4.8V NiMH Battery Charger
AW LiFePO4 RCR 123
This is the charger that will charge all of the above except for the 5v batts...
Ultrafire WF-188 Lithium Battery Charger
As far as the "other" so called 3000mah batts from companies..They are all going to result in seriously less than optimal performance out of a Grand. Most are full of it, and simply "overstate" the actual specs...AW and Redilast DO NOT.
