Nickel Batteries - How to Identify & Tape
They have "Ni-CD" or "Ni-MH" written on the battery.
These kind of batteries are often used for rechargeable power tools and also cordless landline telephones.
How to Tape
Use clear tape. Packing tape works best.
Cover the area where the battery would be delivering power to the device. This is called the "contact point."
This area is usually looks like exposed metal. Cover the exposed metal area with clear tape.
Some nickel batteries have wires leading from the battery to a plastic plug-in. Cover this plastic plug-in with clear tape to prevent the nickel battery from delivering a charge.
A collection of different nickel battery types. They have their contact points covered in clear tape.