Which battery type provides 4 hours of life at room temperature?

• A. Rechargeable
• B. Non-Rechargeable
• C. Both
• D. Neither

Answer: (A)

The amount of time a device runs on one battery charge comes from how much energy the battery holds and how much power the device uses. At room temperature, the chemical reactions inside the battery behave predictably enough for a stated runtime to apply per charge. Rechargeable batteries are built for repeated use; a device that operates for about four hours on a single charge fits the common spec for a rechargeable cell, with the expectation that you can recharge and reuse it to regain that four-hour capability. Non-rechargeable cells can deliver a similar runtime on a fresh cell, but once they’re depleted they can’t be recharged to restore the four hours, so they aren’t suited to repeated operation without replacing the battery. So for a per-charge runtime expectation, rechargeable is the best fit.