These ones at discounted price without code.
$98.99 GOOLOO Upgraded 2000A Peak SuperSafe Car Jump Starter with USB Quick Charge 3.0
$79.99 GOOLOO Upgraded 1200A Peak 18000mAh Portable Car Jump Starter
$54.99 GOOLOO 6V/12V Smart Battery Charger and Maintainer 6-Amp Full Automatic 6-Stages Trickle Charging with Clamps for Car – Tick Apply $15.00 coupon button
So.. I tried this for the first time a few weeks ago.. Out of covid lockdown, car won't start..
It didn't start my 3.0L 6 cylinder diesel.. :(
And yes.. I did press the boost button.. The engine didn't even crank.. Didn't even hear the relays click