I just got a TrustFire TR-001 Dual Battery Charger and an Efest IMR 18650 HD 2250mAh Button Top Battery with a VAMO V3 I recently purchased. I used the 18650 out of the box in the V3 for a few hours while I let the two Efest IMR 18350 LiMn 800mAh Flat Top batteries I also got with the V3 charge. When the two 18350s were done I put one of them in the V3 and put the 18650 in the charger. The charger aparently has an output of 4.2V 500mA and the battery has been in there for at least 6 hours yet it still says it's not fully charged. I'm not totally proficient with the mechanics of electricity but if I've done my math right the battery, if totally drained, should only take 4.25 hours to charge, and this battery still had juice in it when I put it in the charger. Is this something I should be worried about or is this normal? Again, I'm no electrician so I don't know.