Not my work found it on google image but me-thought it was cool.

I did price it out, it cost more than just a cheap charger and display from fasttech.
$1.21 TP4056 1A Li-ion Battery Charging Module at FastTech - Worldwide Free Shipping
$1.93 0.36" Display 3-Digit 3~30V Voltage Tester for 18650 Battery - red LED at FastTech - Worldwide Free Shipping
$1.38 10mm*3mm Rare-earth Neodymium NIB Disc Magnets (5-Pack) 5-pack at FastTech - Worldwide Free Shipping

I did price it out, it cost more than just a cheap charger and display from fasttech.
$1.21 TP4056 1A Li-ion Battery Charging Module at FastTech - Worldwide Free Shipping
$1.93 0.36" Display 3-Digit 3~30V Voltage Tester for 18650 Battery - red LED at FastTech - Worldwide Free Shipping
$1.38 10mm*3mm Rare-earth Neodymium NIB Disc Magnets (5-Pack) 5-pack at FastTech - Worldwide Free Shipping