I can't comment on whether the prices are fair or not. I don't do international monetary conversions.
The
Kick is a drop in module that sits on top of the battery in a mechanical tube mod. It is a microprocessor power regulater which can increase or regulate the voltage (wattage) of a single voltage device. It essentially turns a mechanical mod into a variable power mod. It has similar built-in protections like a regulated mod has. Power adjustment is made by turning a screw head on top of the Kick, so the mod needs to be taken apart to adjust power.
View attachment 253412 Kick in a Silver Bullet mechanical mod
There are two types of
safety fuses. The cheaper type, often called the
2 cent fuse, can only be tripped once in the event of a hard short and will need to be replaced. The more expensive
Vape Safe Mod Fuse can be tripped several times, but multiple shorts protected can ruin it. More like a circuit breaker than a fuse. These attach to the negative end of your battery by means of a small magnet.
View attachment 253413
Mechanical mods have no built-in safety features like a regulated PV does. YOU are the safety device by practicing safe battery and vaping measures. Vent holes in the mod and a collapsable hot spring only take affect AFTER a battery decides to hard short, and may prevent a mechanical mod turn into a pipe bomb. A vape safe fuse is
highly recommended as at least one layer of protection against a battery hard short.
A battery
hard short is when a battery becomes stressed, becomes hot, and an irreversable chemical reaction occurs called thermal runaway. This can be as simple as venting gas to as complex as venting hot flames capable of starting a fire or worse.
http://www.e-cigarette-forum.com/forum/new-members-information/190146-pictures-serious-battery-failure-imr-18650-a.html#post3265928
Safe chemistry batteries such as an
IMR are now recommended to be used in mods for all applications. These batteries have higher tolerances and do not get as "excited" when stressed, and should only vent gas when out of control.
Not that long ago,
"protected" li-ion batteries were recommended. However, the protected circuits in these batteries can fail, leaving the more volatile chemistry of li-ion batteries free go into thermal runaway. These batteries are more violent when in thermal runaway, venting hot flames.
View attachment 253420
It's EXTREMELY IMPORTANT to use the correct batteries in your mod. Please read over this guide I've made for novices to know which batteries are safe, along with recommended batteries to purchase for your particular application:
Battery Basics for Mods: IMR or Protected?