Do not cut battery wires simultaneously because this will cause a short circuit. Due to the unrestricted flow of electricity, a short circuit could cause bodily harm.
Pull the battery off of the holder.
Cut each of the wires to the battery one at a time using a pair of wire cutters.
To replace the battery, you will need to strip both of the wires from the circuit, and both of the wires from the battery. You will then need to twist and solder both pairs of wires(red to red, black to black). You can find directions on soldering here.
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