Originally Posted By: SaffordHunterSo I’ve been looking at the external battery pack made by FLIR for my thermal and it’s 6700 mah. What i used to use to power my Night vision was an iMuto 20000mah portable phone charger. That’s over 3x’s the battery life of Flirs unit. I keep it in a stock pack. Is there any risk of damaging the Flir? My answer is for the new Boson core Flirs such as the PTS series and Breach. The one from TNVC/Night Goggles is 6700 mAh. We have ran a Flir PTS scope for over 10 hours using this battery pack in sub-freezing conditions. It should last you all night. However, to answer your question, yes you should be able to run any 5v battey pack. Personally I wouldn’t go over a 10000 mAh pack if mounted on the gun or the scope just due to the extra weight. I have a 10000 on one Flir and the 6700 on another. Only 2 oz difference between the 2. A 20000 adds almost 10oz extra. You simply don’t need that much battery for the scope but it will work with the correct cable to connect to the Flir.