Problem with TK75 (batteries?)

I hope I'm not posting this in the wrong place. I have a brand new Fenix TK75 that will only run on turbo for about 10 seconds until it powers down to high. I'm running it with 4 nitecore NL189 3400mAh protected rechargeable batteries. These batteries were purchased new and put right into the light without any topping off.

I am currently charging the batteries to see if they were sent with a low charge and possibly causing the problem. I have two questions.

1. Could low batteries cause this to happen?

2. Is there a "standard" charge for sending new batteries?

Thank you for any input from a newbie

Hi there,the cells will be around 3.6v or 3.7v out of the box so require charging to 4.2v . As they are around 40% charged it will drop out of turbo to high .
They ship at 3.6v as that is the best storage voltage .So stick them on charge,try again and enjoy the awesome tk75
:welcome:

Thank you for the response. I'll try again after charge is complete. I see a battery tester purchase in the very near future....like today

No problemo,yes it makes good sense to have a MM at hand,keep an eye on the cells/charger. More so off the charger after 10 -20 mins rest to get an idea all is well and the charger is not over charging along with the cells holding charge. No need to do it daily,just get an idea then monitor every so often

Presuming its the 2900lm version you should get 15 mins before step down,if light is not too hot ,you can step back up to turbo etc. You may get 3 or so step ups before loosing turbo,then high is as much as it will hold. Then at next available chance top off cells again ready for next use . You will soon get an idea of when to recharge..........

Thank you for the good advice. It's functioning perfectly now. What a great light!

Great stuff:thumbsup: it certainly is,it just does everything so well. Certainly in my top few fav lights for flood /throw/UI/value for money . Enjoy