# Several Judgment Methods For Electric Bicycle Battery Models

- Jun 18, 2019-

The lead acid battery has a voltage of 2V per cell, and each cell consists of 6 cells with a voltage of 12V. The most common lithium battery combination for electric bicycles is three or four batteries connected in series, three in series are 36V, and four in series are 48V. There is now a 16V single battery consisting of 8 battery cells.

The capacity of lead acid battery is regulated by voltage. Take 12V lead acid battery as an example.

The minimum working voltage is 10.5V, the maximum working voltage is 13.5V, and the highest working voltage discharge to the lowest working voltage means 100% discharge. The battery stops working, and the amount of electricity discharged during this process is the capacity of the battery.

Below we combine the battery voltage and capacity:

The common capacity of 36V is: 10Ah, 12Ah; individual 14Ah, 17Ah, 20Ah.

Common capacities of 48V are: 10Ah, 12Ah, 14Ah, 17Ah, 120Ah; individual 15Ah, 16Ah, 18Ah, 22Ah, 24Ah.  Some consumers may not know what type of model they are after buying an electric bicycle. At this time, they can be identified from the charger by comparing the output voltage and output current on the charger:

In general, the 36V battery is labeled as follows: "Output voltage 36V - 42V, DC×A". The corresponding relationship between the output current and the capacity of the battery is: 1.5A corresponds to 10Ah, and 1.6A corresponds to 12Ah. The 48V battery is marked as follows: "Output voltage 48V - 59V, DC × × A". The corresponding relationship between the output current and the capacity of the battery is: 1.7A corresponds to 10Ah, 1.8A corresponds to 12Ah, 2.0A corresponds to 14Ah, 2.3A corresponds to 17Ah, and 2.5A corresponds to 20Ah.

In addition to the charger labeling method, it can also be calculated by the battery itself. As mentioned above, the current single-cell lead acid batteries generally have 12V (composed of 6 battery cells) and 16V (composed of 8 battery cells), which are indicated on the single cells, and because the combination of lead acid batteries is In series, the battery voltage can be obtained by multiplying the voltage of the single cell by the number of cells, and the battery capacity is equal to the cell capacity. For example, after the battery box is opened, it is found that there are 3 batteries. If the three batteries are 16V, then the voltage of the battery pack is 16V×3=48V; if the three batteries are 12V, then the voltage of the battery pack It is 12V×3 = 36V. So, when the battery box is opened, I found 4 batteries? At this time, if the four batteries are 16V, then the voltage of the battery pack is 16V×4 = 64V; if the three batteries are 12V, then the voltage of the battery pack is 12V×4 = 48V.

It can be seen that the same 48V battery pack may be connected in series with three batteries or four batteries in series.

The capacity is better to distinguish. If the battery indicates "6-DZM-10", the battery/battery pack is 10Ah. If the battery body indicates "6-DZM-12", the battery/battery pack is 12Ah. Of course, the virtual battery capacity is beyond the scope of this discussion.