Hi, sorry that we don’t have the paper instruction for those DIY products and all the info are on the website. Did you get this Lithium Battery Protection Board? Please make sure you didn’t reversely connect the wires of the “VH” “VM”. If not, please follow the wiring and check it again.

if it still cannot work, please reply us and then tell us more details about your using environment? If you can, we sincerely hope that could you please send us a picture to let us check what is the problem detail?
Looking forward to hearing from you.
Thanks!
DROK

Hi Art,
Yes, this board can prevent over charging, the P+ and P- are output interfaces, also are charging interfaces.
You can use this board to make a cordless drill lithium battery pack.
Any other questions, feel free to contact us.
Best regards,
DROK