Be careful of old batteries - some don't charge at all.
Even genuine Lenovo batteries that have been on the shelf for more than a few years usually can't be charged at all. The one I got was in original packaging, unopened - it would not charge and reported an error.
Round 27W LED Work Light Floodlight Truck Car Magnetic Base Lamp Light 12V 24V
18 aug 2018
14 Watt, not 27 Watt (12V).
Not 27W, actually 14W at 12V (1.2A). Supplier has excuses like "Please notice that 27w is the highest power. It won't keepin the highest power when it working. The lumens is brigher enough. We suggest that we can issue USD 5 refund as discount"
So it's great if you want a 14W light.