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To determine if a lithium battery is fully charged using a multimeter, you can measure its voltage and compare it to the manufacturer’s recommended fully charged voltage for the specific type of lithium battery you have.
For example, if you have a LiFePO4 battery, the manufacturer’s recommended fully charged voltage is usually around 3.6-3.7V per cell. So, if you have a 4-cell LiFePO4 battery, a fully charged voltage would be around 14.4-14.8V.
To check the voltage of the battery, set the multimeter to measure DC voltage and connect the probes to the positive and negative terminals of the battery. If the voltage reading matches the manufacturer’s recommended fully charged voltage, the battery is fully charged. If the voltage reading is lower, the battery is not fully charged and needs further charging.
