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<blockquote data-quote="wingless" data-source="post: 8606744" data-attributes="member: 670965">My method for testing batteries falls back to the tried and true old-school method. If the ambient temperature is not 20°C to 25°C, then adjust the measured results to the manufacturer&#039;s specifications. (I prefer to just test in the specified temperature range.)Step 1 - Properly and fully charge the battery to 100% for 24 hours.Step 2 - Fully disconnect and allow the battery to remain idle for 24 hours.Step 3 - Connect the test equipment that will permit measuring the battery voltage, measuring the output current and permit application of a C/20 Hour load. Note that C is the battery capacity, such as 100AH, Ampere-Hour. In that example 100AH / 20H = 5A loadStep 4 - Start the test, noting time zero, voltage measured at time zero, apply the C/20 Hour load and current measured at time zero.Step 5 - Log the voltage and current throughout the test.Step 6 - Stop the test, remove the current load when the voltage reaches the manufacturer&#039;s specified end value, such as 10.5V.Step 7 - Properly and fully recharge the battery to 100% for 24 hours.The battery meets the new nameplate rating when the measured ampere-hour capacity is met or exceeded.The battery is typically considered end-of-life when the measured ampere-hour capacity is under 50% of the nameplate rating, in this example if the battery cannot supply 50AH during the test.</blockquote>

[QUOTE="wingless, post: 8606744, member: 670965"] My method for testing batteries falls back to the tried and true old-school method. If the ambient temperature is not 20°C to 25°C, then adjust the measured results to the manufacturer's specifications. (I prefer to just test in the specified temperature range.) Step 1 - Properly and fully charge the battery to 100% for 24 hours. Step 2 - Fully disconnect and allow the battery to remain idle for 24 hours. Step 3 - Connect the test equipment that will permit measuring the battery voltage, measuring the output current and permit application of a C/20 Hour load. Note that C is the battery capacity, such as 100AH, Ampere-Hour. In that example 100AH / 20H = 5A load Step 4 - Start the test, noting time zero, voltage measured at time zero, apply the C/20 Hour load and current measured at time zero. Step 5 - Log the voltage and current throughout the test. Step 6 - Stop the test, remove the current load when the voltage reaches the manufacturer's specified end value, such as 10.5V. Step 7 - Properly and fully recharge the battery to 100% for 24 hours. The battery meets the new nameplate rating when the measured ampere-hour capacity is met or exceeded. The battery is typically considered end-of-life when the measured ampere-hour capacity is under 50% of the nameplate rating, in this example if the battery cannot supply 50AH during the test. [/QUOTE]

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