Question
What is the minimum allowable discharge voltage for maximum life of a standard 12-volt lead-acid battery?
Answer Options
- A) 6 volts
- B) 8.5 volts
- C) 10.5 volts
- D) 12 volts
Correct Answer: C
Explanation
Standard 12-volt lead-acid batteries (including automotive, flooded, and GEL types) are designed to be fully discharged only to a specific minimum voltage level to prevent permanent damage. If the battery is discharged much beyond this point, the process of sulfation occurs rapidly, leading to irreparable damage to the plates and a drastically shortened battery lifespan.
For a 12-volt battery (which has six 2-volt cells), the minimum safe discharge voltage is 10.5 volts. Discharging below this level is considered deep cycling, which should be avoided to ensure the battery provides its maximum rated lifespan and capacity over many charge/discharge cycles.
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