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Examoogle • User • info@examoogle.com • EE-2024-8821
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Trickle charging of a storage battery helps to
maintain proper electrolyte level
increase its reserve capacity
prevent sulphation
keep it fresh and fully charged
keep it fresh and fully charged
Quick Summary: Trickle charging refers to the continuous supply of a very small, low-magnitude current to a storage battery to compensate for its natural self-discharge. This process ensures the battery remains in a fully charged state and ready for immediate use without causing damage due to overcharging.
Trickle charging refers to the continuous supply of a very small, low-magnitude current to a storage battery to compensate for its natural self-discharge. This process ensures the battery remains in a fully charged state and ready for immediate use without causing damage due to overcharging.
Itrickle≈Iself−discharge — Current magnitude required to maintain terminal voltage
Qlost=∫0tIself−dischargedt — Total charge lost due to internal chemical processes
The principle relies on counteracting the internal chemical self-discharge rate of the battery. By supplying a current slightly higher than the self-discharge current, the chemical potential difference at the electrodes is maintained. This prevents the loss of state-of-charge over extended periods of inactivity.
Trickle charging uses a very low constant current to maintain the battery voltage.
It is primarily used for standby power systems like UPS, emergency lights, and engine starters.
The current is typically 1001 to 10001 of the battery's ampere-hour capacity.
Prevents deep discharge cycles which are harmful to lead-acid battery plate life.
Ensures immediate availability of full capacity
Extends service life by avoiding deep discharge
Simple control circuitry required
Potential for minor electrolyte loss in vented batteries
Continuous power consumption
Uninterruptible Power Supplies (UPS)
Standby Engine Generator starting batteries
Emergency lighting systems
Float charging is similar but usually involves maintaining a specific constant voltage rather than just a minimal current.
Option C is incorrect because trickle charging does not specifically remove existing sulphation; it mainly prevents the conditions that lead to its formation.
Option A is incorrect because electrolyte levels must be maintained by periodic inspection and distilled water top-ups, not by charging.
D is correct — Trickle charging provides a low current to compensate for self-discharge, ensuring the battery stays fully charged and operational.
Always distinguish between 'Trickle Charging' (low current for maintenance) and 'Boost Charging' (high current for rapid recovery after deep discharge) in exam questions.