How long did you use your light until the thermal protection kicks in? Were you in a hot environment, humid, cool place? got wind?
NS might be right about the battery being low already.

From spec, WF-139 has separate charging channels, you can charge one battery or two batteries. I suggest once the light turns green, you can remove that battery from the charger. Red (fast blinking red) means it's still charging.

Does your light works now?

Hey, did you mean when you immediately place two batteries on the charger (assuming they are low), the left channel shows red and the right channel shows green?

I'll try to do some charging test on my own tonite. I have a WF-139 too.

This is the disadvantage of using protected cell, the light cut off without warning, luckily you are not in the side of the cliff or something,  I don't know in the flashlight there are any termal protection circuit, I over seen one has this, but I forgot what model, I think it is a surefire. For battery, I am sure most if them don't have thermal protection circuit, it just protect via measuring the voltage, so it will cut above 4.20 to protect from overcharge, and cut below 2.7 to protect from overdischarge, and also if sudden drop in voltage it also cut to protect from short circuit (assume only), so you cannot use protected li-ion in high power Xenon.

And no worries, bro sniper69, your cell is safe, no damage due to the cut off protection at 2.7, but can you share with us what are the damage cost you? eg : worriness, jatuh dlm longkang etc. Just a real life sharing pls.

And no problem if you charge it in 1 channel, but if your cell is dead (way below 2V), then the charger will not start charging anymore, this is a protection function in all the charger.

Have a nice illuminated night, every day!!
haha, new way to greet ppl, not like "Sudah Makan" we greet by "Have you lite today?"

1) Zen|th - Jeremy - 017 6349 499 - age 19
2) Susuman - CC Yong - PM Phone Number - age 19 (16 years ago)
3) old newspaper - Wei - PM phone number - age 18 ( 15 years ago )
4) polkiuj - Walter - 016-340 4338 - age 18
5) strinq - Adrian - 012-3606297 - age 72

i'll call you when i reach your place....now loading up my lights with freshly charged batts...

Want thrower?

Tiablo A10