BH4HKF A single cell with a nominal voltage of 3.2V, connected in series with four cells to produce a total voltage of 12.8V. The maximum charging voltage is 3.65V, and the fully charged state is 14.6V. After disconnecting the power, there will be a drop in voltage, which eventually settles between 3.3V and 3.4V. This voltage drop is inherent to the battery's characteristics. The central voltage of lithium iron phosphate batteries typically ranges from 3.2V to 3.4V. Therefore, the battery voltage is between 12.8V and 13.6V. The battery is not a 220V-to-13.8V converter; using it will result in a voltage drop.
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