I will try and charge these cells if they rest at higher voltage and measure standby drain.
Tested just in case with an Agilent 34401A bench meter and it reports 666 µA with 1P and 44 µA with 2P.
I dont trust clamp when measure low current
How about using normal multimeter
666, LOL. I’m so scare
666uA is quite high
And just in case I measured between the battery carrier and head with all the batteries and got 667 µA. Same result for only two batteries in series. Also used button tops to make sure all the batteries have good contact. I suppose this would be the best guess of the true drain so far.
…and i assume the newer version has the same driver… 
Yea i dont see why they would have changed the driver? It was the 4S that was having the issues?
Parasitic drain is the very reason I prefer mechanical switches over electronic switches!
(although I have a few side switches, they are only welcome if they can be locked out)
I hope there will be an updated version of that driver somehow, because this ain`t good!
Yeah, you’re right, and i remember seeing a picture of the driver in a topic of yours, and it’s the same as mine…
Such a shame they didn’t have us on BLF test the preliminary product before putting it on the market… (although they kind of did use you first buyers as Guinee pigs, in a way…)
The driver basically sucks, but it’s retained by a fat nickel plated pure copper ring (?!) and the ring on top of the battery tube also.
The springs look silver plated.
…but then the MCPCB shelf is less than 2mm thick ?!
Strange things…
It does look awesome though. :+1:
But as said:
Someone who understands this driver could be helpful, maybe have a solution for this high parasitic drain phenomenon.
You can lock out the HT03 by unscrewing the battery tube half a turn.
Works very well, kind of seems to be designed to do so, with the big contact discs.
Had the MT03 sit on the shelf with the fully charged batteries (18650GA) inside for 8 days (188 hours). Charged the batteries and they received 201 mAh in total (52+54+50+45 mAh). So on average 201 mAh / 188 h = 1.07 mA which would equal completely discharging the batteries in 1.5 years. So it is not totally negligible even when subtracting the small battery self discharge or the small difference in charge-discharge capacity. But not quite there with OP’s drain (empty in 6 months). The standby current may of course increase when the voltage drops.