Had to order from Neal. Seems everywhere locally is either sold out or asking $10 a battery.
Check out Matt's review on Youtube. Awesome!!!
Good USA battery stores:
Make sure you get the button tops.
I received my GT4 yesterday from Neilsgadgets. And I also received my order from Matt, who recommended some batteries for it in his review (https://youtu.be/tM9XL4rRw2A). Light is awesome. Can't wait to test it out later.
Doesn’t look like mine has been sent out yet
Just got my tracking number.
Just received my BLF GT4. 
Measured at 9.5 meters. 4730 lux which gives 1306 meters of throw with only 4 batteries that draw power.
Not bad, what cells are you using? Are they freshly charged?
Fully charged. Tested around 30 seconds. Sony VTC6.
Ah, the 30 seconds would explain it, I generally test at 5-10 seconds. These style lights generally drop off for the first 30-60 seconds as things heat up and then stabilize the drop off. I am just too lazy to time the tests between all my lights to keep them consistent lol.
And remember 4 batteries did not make contact. I measured it now and the reading was higher this time.
yeah, that would also add to the number lol.
Then and I like 18650 Battery Store - Trusted Supplier of Lithium Ion Batteries. I buy all my 21700 cells from here, 30T’s are 4.99, 40T 5.99, P42A 5.99.
Two different lux meters. Better now with all Sony VTC6 batteries that draw power in the batty carrier. With 4 batteries i could only get around 4700 Lux.
This doesn’t seem right
yeah, that looks like the button came unsoldered. Can you find the button in the packaging? You should be able to solder it back on if so.
If not you can remove those in the short term and they should be able to send you a replacement.
thanks TA; no i didn’t see the button anywhere
you say these little red slides can be removed? Another button fell out after playing with the light a minute and the batteries came out at different temperatures and voltages which leads me to believe that not all batteries are making contact
Yeah, First mark the orientation of the top of the carrier. Then remove the hex screws from one end of the carrier and you can pull the end off and remove the center pcb’s. Then just reassemble in the same orientation it came apart.