This is a battery clip with 12 inch (30.48cm) wire leads. If you want to attach a 9V alkaline battery to an EasyMini or other flight computer, this will do the trick.
You can buy 9V battery clips elsewhere, what makes these "interesting" is the long leads. You can trim them to fit in nearly any avionics bay design!
These snap together cases are great if a hard knock or a fall from 1,000 feet has left your altimeter looking a little rough around the edges. Each case includes two parts, which securely snap together
RG15B, Low-Drag Rail Guides for 1515 Rails, BulkheadType
RA75P, Retainer Assembly, 75mm, P
These batteries are approximately 0.2x1.0x1.4" (5.5x25x35mm), and weigh about 9.5g (0.33oz).
Tracker only - optional battery available here. The wire whip antenna option has equivalent LoRa performance and the antenna can stick through bulkheads to save space.
These batteries are approximately 0.25x1.2x2.0" (6x30x48mm), and weigh about 19g (0.67oz).