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Coiled spring wire or flat tabs that press against the battery terminals are the two most common methods of making the electrical connection inside a holder.
A cell holder is a simple device for holding 1.5V cells {batteries} for use in school laboratories. A cost-effective way of making simple cell units to use with 4mm leads, follows.
Avoid loose wires, cables, and connections. Assume any exposed metal is live with electricity unless otherwise verified. Familiarize oneself with all ON/OFF buttons on equipment, circuit breakers, and disconnect switches of a bench
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