I created a device which is powered with 6 NiMH AA rechargeable batteries. The device uses between 10-100mA current. It is nothing special about it, there are some foil and electrolyte capacitors from + to - to stabilize the power of some chips and there is a microcontroller.
As I understand, the NiMH rechargeable batteries are sensitive for short-circuits. So I wonder if over time an element fails this could lead to a short-circuit.
It there any protection for the rechargeable batteries necessary for a such setup to protect the batteries? Or more precise: Is it usual to add some protection for the rechargeable batteries in battery powered devices?