If you would like a lower tech option you could use this:
https://www.amazon.com/dp/B095S81XK4/ref=cm_sw_r_apan_i_GEK815X97PK4JWQNA2VN?_encoding=UTF8&psc=1
It is a just a battery pack that will fit underneath Dirk's bracket. It has a lower current draw than the charging pad so it won't freak...