Some advice needed for a newbie - 18650's

Batteries and Chargers Rechargeable Batteries
1

Hello,

I have always loved torches, started when I was young and got a bunch of Maglights. A few years ago I got a Fenix L2T and its been a great torch. I needed a decent torch to go along with my L2T for cycling so I purchased an UltraFire C8 XM-L 3 mode from Manafont.

Anyway, I just received my batteries + charger from DinoDirect (9 days delivery to the UK, very pleased!) and was thinking I should post on this great forum.

I have been reading so much info about these 18650 batteries + torches and all the info has fragmented in my brain.

I would like to know if the info I think is correct is actually correct, if not please correct me.

1. The batteries I bought are the Trustfire flames 2400mah protected. Since they are protected they will shut off in the flashlight when they require charging. I will never leave them to charge when i'm not watching them, that should be fine due to them not having memory.

2. Never overcharge the batteries. I will put the charger on my desk so I can see when they are charged and imediatly disconect and test with my multimeter to make sure they have not exceeded 3.7v......What do i do if it is above the stated 3.7v for what ever reason?

Is there anything else I should know? I feel like i'm jumping into a sea of information that is going to spend all my money :)

Edit: I just tested the batteries with my voltmeter and it says they are both sitting at 3.92v. Isn't that above what they should be?

2

They should be at or under 4.2V when fully charged

3

Ok thanks, why do they say 3.7v on the side?

4

That is the nominal voltage. A typical value is given since the voltage is dropping from 4.2 to 2.75.

So it's just a given rating. Think about it this way: 4.2(charged)+3 (depleted)= 7.2 So that's averaging 3.6V

5

Ok thanks very much. So I should make sure to charge them to 4.2v (I will check my charger cuts off at 4.2v before my torch comes)