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I used one of many (Battery Management System) BMS on the marker to convert my Ca-Ng battery to Li-ion one. An example: this

When bit is stuck or when you want to fixate a drill on drilling position you can trigger safety mechanism and BMS will disconnect your screwdriver from the battery. I suspect that this is over-current protection. And I am very happy it exists rather than burning motor. But drawback of this is that to recover to normal operation mode i need to connect BMS back to an external power source, even for a second to unblock protection circuit.

On another screwdriver I have (branded, Li-on) when drill is stuck or other over-current activity happens power will be disconnected but in less then 1 minute screwdriver is operational again without any extra actions.

What can be done to implement such functionality? I suspect that there should be some sort or multiple-use (thermo-)fuse that would recover on its own?

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  • \$\begingroup\$ To my taste, both behaviors are not acceptable, nor waiting whole minute, nor connecting-disconnecting the circuit. You need to get a better BMS, or design your own to accommodate the stall current of your drill, and to have instant recovery. \$\endgroup\$ – Ale..chenski Aug 18 '17 at 8:52
  • \$\begingroup\$ Ali, what you say makes sense, so I am open to any ideas. if something else could be used--let me know \$\endgroup\$ – borys86 Aug 18 '17 at 13:23

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