Hold the battery vertically 2–3 in (5.1–7.6 cm) above a hard, flat surface. As alkaline batteries go bad, zinc oxide builds up inside, making the battery bouncier. This simple drop test helps you determine new batteries from old ones. Start by taking the battery and holding it above a hard, flat surface like a metal table or marble countertop.
There are many different types of batteries, and you can test all of them to see if they're charged or not. Alkaline batteries bounce when they're going bad, so drop one on a hard surface to see whether or not it bounces. Take an exact voltage reading with a multimeter, voltmeter, or battery tester to get an exact charge reading.
Check with the manufacturer for the full charge. A 3.7-volt lithium battery usually stops working at 3.4 volts, so recharge or replace your battery if it s approaching this level. Perform a load test with alkaline batteries for the most accurate result. A load test measures the battery's power when it's in use.
A healthy 12-volt battery should maintain a voltage range from 9.6 - 10.5+ volts under the load for 30 seconds straight. We don't expect you to run the starter for 30 seconds for starting batteries, so if you see the voltage meter drop within the voltage range and it sounded like a good strong start, then you probably just had a discharged battery.
This recommendation is based on the results of various tests, including voltage measurement, load testing, and capacity testing. If the battery is deemed to be in good condition, it means that it has sufficient capacity, low internal resistance, and stable voltage to meet the vehicle's electrical demands.
Set the multimeter to the DC voltage mode and connect the red lead to the positive terminal (+) and the black lead to the negative terminal (-) of the battery. A fully charged battery should read around 12.6 to 12.8 volts. If the voltage is significantly lower, it might indicate a weak battery.
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