Where is the best heating elements locations?
You may confuse of where is the heating element loacted?
Mostly heated jacket has 3 heating elements, 2 chest and 1back. Also,some do provide only on the back,like upper back ,middle back and lower back.
Some heated jacket will also has more that 3 heating elements, including collar, and maybe elbows.But that will have double controller and may be use app control, much more expensive.
It' quite depend on your need ,but bascial that I think the back will be important, chest will be the next (but remember not to hot).The rest locations will be up to your need.
You may also surprise that heated jacket do not heat the whole cloth, instead, heated up just little part of it.
You can only find heated liner jacket used in motor cycle will have full heated area.
For most of the heated jacket,it's powered by protable battery. It's designed to have only few small heated pad is quite a balance between using time and protablility. Mostly can work for 4hours,if you do need to play outside all day,you have to buy another battery.