Now that’s a Proper Meter

[scott2000]

I guess this is a triple 12v pack

https://www.rossomotors.com/products/battery-pack

for this 36v 4wheeler

https://www.amazon.com/Rosso-Motors-Wheeler-Electric-Motorcycle/dp/B072B6ZD2J

 

[cyrano]

Plenty of those around. Ex: 36V scooter battery, not even 60$:

https://nl.aliexpress.com/item/36v-4400mAh-Scooter-Battery-36v-for-Samsung-for-LG-Cells-Bateria-for-2-Wheel-Smart-Self/32455880308.html

Or a Dewalt 36V? Take apart here:
https://www.rcgroups.com/forums/showthread.php?587606-Disassembly-of-a-DeWalt-36v-Battery

 

[Gold]

It looks like replacement batteries for a small UPS are about the same price as hacking a power tool battery.  I think those would be easier to deal with.  It still seems like it will be a few hundred bucks to get it going when you include a charger.

 

[PRR]

Motorcycle/tractor battery, small inverter, and jumper cables to charge from your car will be $50.

AND will power *any* small 120V test gear.

 

[Gold]

Ahh, I missed it the first time. 12v - inverter- AC input. That makes sense, and  like you said will work for everything. Thanks!