Bringing this topic back to life, hopefully this information will help to someone.
Some 60V tools are discontinued and can be purchased for pennies when they don't have battery and/or charger with them.
For example, Craftsman 60V (not newer V60 line) tools, Lawnmaster 60V tools. It took me a while to figure out that they use same form factor battery (Lawnmaster 60LB5025-S similar to Craftsman 60LB2021-S similar to Craftsman 151.98833).
I just purchased brand new Lawnmaster trimmer CLGT6014A for about $40 US, no battery, no charger. I was hoping to convert it to Dewalt 60V battery. Opened trimmer - figured out that there are 3 wires to the battery - plus, minus and mystery yellow wire which marked as TEM on the circuit board.
Tried to run tool on the bench on 30V, just with 2 wires (power) - runs 2 sec, then dies. Then I did some research, found this thread
. Someone suggested 4.7 kOm to the ground - no luck. Tried to short "temp" wire to 60V, to ground, tried 1kOm, 10kOm, 100kOm to the ground - tool either does not start at all or runs for 2-3 sec.
Then I did some more research and found that temp sensor could have 10 kOm resistance. I had newer Craftsman V60 battery in my shop. It has completely different design, but I've checked it anyway and found that one of the contacts indeed has 10 kOm to the ground. I've tried 10 kOm already but with wrong voltage (30V instead of 60V). So I created approx 58V from 2 power supplies and tried one more time with 10kOm to the ground. Success! Tool runs continuously!
So if you will see similar setup - 3 wires (actually battery has 4 contacts but 2 of them are ground), 60V, you can try 10 kOm as "temp sensor".
Hopefully this post will save few discontinued tools from dumpster. Dewalt adapters are very cheap on Aliexpress, and most people have some of Dewalt tools and batteries in the shop. Don't like Dewalt? You can adapt any battery with 60V output. Just be careful do not overheat battery, or install proper temp sensor instead of 10kOm resistor.