Question 543Electricity & Electronics - Assistant Engineer

The correct answer is C) Leaving the battery in a discharged condition for a great length of time. When a lead-acid battery is left in a discharged state for an extended period, the lead sulfate that forms on the plates can harden and crystallize. This can prevent the battery from accepting a full charge, even when connected to a charger. The hardened lead sulfate makes it difficult for the chemical reactions to fully reverse during the charging process. The other options are incorrect because: A) Reversing the charging current can damage the battery, B) Adding distilled water is a normal maintenance practice, and D) Coating the terminals is recommended to prevent corrosion, but does not directly impact the battery's ability to accept a full charge.