I am building , (Have built) several semi Mech MOds, using the Flat Pack LIpo batteries. They come in sizes from 65mah to 13,000mah. I am usingone now, that has a 7900 mah battery with C=100. Thats right, 100. And, It over ranged my Desktop fluke on the tesst bench trying to measure current total max. continuous. It went to 100 Amps with 10:1 clamp on pick up. It instantly went to greater than 100 amps and stayed there for the couple seconds I tested it. Things started melting fast. 510 connectors, I as WARNED to watch for solder going liquid, IT DID. BUT, all that, was due to the load on it. .025 ohms. I used a dummy RF load that I use when I am building amplifiers, it is good to 1000 watts, so no problem there, just getting the resistance low enough. BUT< with a .08 ohm atty., would have only gone to 50 amps. THAT is via the laws of PHYSICS, not the batteries fault. THOUGHl. I can get those flat packs in 4.2 volts, or 8.4 volts, same current. Only 20$ to 60$ for super max. battery. They have the same look as a deck of cards, but smaller. They are 93mm long, x 478mm side to side, x 18mm high. VERY usuable in most boxes. I"ve gotten it in some tight boxes. All; of the batts, no mater the mah rating or voltage, are almost exactly the same size. And, have a 4mm or 5mm bullet connector times two on one end facing up, they are how you attach your wires. They come with 90 deg. gold plated bullet connectors w/12 ga. wire, that is VERY flexible. But, it is routed, perfectly for our use. From back of pack, over top of battery, straight towards front of pack. They are about 15cm long, but, can be cut to choice. Just go to towerhobbies.com and search for Lipo 1S batteries, IF you want a 4.2 volt battery, they call them 3.7 volt, YOU know how that works, center of operating range and all. And, look for 2S batteries, if you want the 8.4 volt batteries.
Just passing on a VERY long lasting alternative to our round batts. Many even have GOOD warranties. Hard case, pretty pics. Whata more could you want?
BE CAREFUL, They need FUSED, as theye are capable of an atrociously large outrush of current. Put a couple in parallel, if you can't find one big enough, that's what I did.
Safe Vaping;
Yellow Hawk