Nice, I still have to build a high power 520 for myself., I built many 520s > 1 W, but they all ended up going to good homes.
I still have a few of these left
View attachment 76310
a V1 + several Black Bucks 7 or 8 M44s and a few other hosts...
Edit: To answer the OP above, firstly Im very glad to hear the laser is still going strong after 8 years! I just searched through all my PMs to find you and it looks like you bought the following:
Polished 445 Kryton Groove with G9 lens and X-drive V7 buck and GITD in March 2015.
In these lasers an X-drive V7 buck was used and it will take 2 x 16340 batteries for full power. Please note however, from my old FS thread:
"Notes: The duty cycle is mainly due to the heatsinked X-drive which must cool between cycles. At 1 min the head of the laser will be starting to get warm. I prefer to look after my diodes and therefore recommend shorter run times to extend their lifetimes.
Full power is obtained using 2 x 16340 batteries, however you can also run the lasers on one 18650. The latter will give a around 250 mW and can thus be considered as a low power mode.
I actually used only one 18650 for the beam shots and after a few mins the lasers were not even warm. This means you can run them easily for 5 - 10 mins without issue - dont do this with 2 x LiIon!!
The GITD will last for several hours and needs around 15 mins to fully charge."
!!Important!! Please note + to head and - to tail cap! There is no polariry protection!
Hope this helps! Have also responded to you via PM just in case you miss it. ATB