Hello. Dumb question coming. I got a new Trustfire Tr-001 Charger today. My first foray into li-ions. It came with NO instructions. Does it matter which end of the battery goes up or down. The website said reverse polarity protection so I'm guessing it doesn't but want to make absolutely sure so as to still be here tomorrow.
thank you!
patrick
Up (+) should go only UP
Don't try the other way.
Sliding tab is 99.999% of the time the negative end , and it does matter which way they go in or the charger will not work ..
With some chargers , that have no protection against the batt going in the wrong way , bad things could happen ...
If you look carefully , the charger should be marked + and -
after you are sure mark it your self too , mark batteries too wth
also charge them in the garage or windows open and only when you are around
just my opinion to be extra safe
It is marked in the little cut outs on each side .. old is correct metal slide is the negative / bottom .
I charge batteries in front of me so that if they burst into flames I'm there to scream like a girl and run out of the room like a mad man .Charging lithium ion on these chargers takes quite a while ..4 hours ??
4 hours is one of the faster chargers, many chargers need longer time. On my website there are a lot of charger reviews where it is possible to see how fast the charger is. I usual uses a old cell with only about 2000 mAh, but it can easily take 5 to 6 hours to charge.
HKJ, I have never seen your website before. Very good info on there.
HKJ those are great reviews. There's a new Xtar WP2 II charger, looking forward for your review on it.
I am working on it and will publish a review in a few days.
I use this model charger and can confirm that the positive(+) is at the top and the sliding tab is for the negative(-). I'm not about to test the reverse polarity protection circuit on purpose though...
Well I had not heard about the lengthy charging time being that long. I received (2) Trustfire Flame 14500s in the mail. They tested at 3.8V. I put them in the charger and it took about 1 hour and 15 min to completion, 4.18V I believe it was. My cells are protected. If I use these in my light continuously and the protection circuit shuts off my light, what would the voltage be at that point, anyone? And from that point, that is when it would be hours and hours and hours to charge??? Still, for $7 and all the various kinds it charges, a great deal IMHO.
Thanks for all your replies.
patrick
p.s. I enjoyed the humorous replies 
The OPs charger is S-L-O-W. I don't know about actual number of hours, but fully charging two partially discharged 18650 cells will take several hours to complete. 14500/10440 cells charge much more quickly.
If a LiIon charger charges a cell in less than a hour it is definitely using to high charge current. 1½ to 2 hours is the best time when not going above 1C and following a CC/CV charge profile.