How to make DIY measurements on lithium batteries with a multimeter and common items?

　　Although the service life of lithium batteries is long enough, they are chemical products after all, so there will be undesirable situations.

　　Usually, we only have one multimeter in hand, so how do we make DIY measurements on lithium batteries with only the multimeter and common items?

　　We can simulate the discharge of lithium batteries.

　　First: According to the battery capacity, such as 12V60Ah, according to the safety discharge standard 0.2C, that is, one-fifth of the capacity current, 12 ampere discharge.

　　Second: Be a high-power resistor, the resistance value is 12 (V) ÷ 12 (A) = 1 (Ω). This can be done with professional high-power cement resistors.

　　Third: If there is no cement resistance on the hand, use the common heating wire for heating. Measure a section of the electric furnace wire, measure its impedance with a multimeter, and then convert it according to the length and impedance, and finally intercept the electric furnace wire with an accurate impedance length.

　　Fourth: Make a mark on the cement resistance or electric furnace wire, and connect two connecting wires at the two outer ends of the mark.

　　Fifth: The multimeter is placed in the DC voltage range, and the test leads are connected to both ends of the resistor in parallel. Temporarily contact the battery cable connected with the red test lead to the positive terminal of the battery, and the other to the negative terminal.

　　Sixth: Connect for more than 10 seconds, if the voltage remains above 12 volts, it can be preliminarily determined that the battery is good.

　　Lithium-ion battery (LIB) has become the main energy storage solution in modern social life. Among them, lithium iron phosphate batteries are a perfect replacement for lead-acid batteries, and they are the first choice for grid-connected peak shaving, off-grid energy storage, photovoltaic energy storage, UPS, data center and other industries.

　　This DIY measurement method is not an accurate measurement, but it can be used for preliminary analysis.