I have a Sanyo 18650 2600mah Li-ion Battery That I received on Thursday and a New Trustfire TR-001 Charger. I have charged the battery for 12 hours and the light is still red. I put it in my apv and checked the voltage and it reads 3.8v. I put it back on the charger for another 4 hours and then checked it on the apv now its 3.9v. I used it for about 20 mins and it dropped back to 3.8v. The charger has a slide switch for 3v and 3.6v and it is in the 3.6v position. Anybody have any advice?