How to Distinguish Battery Size Models?

[VanFernando]

Open the battery compartment and count the number of battery cells. If there are three cells and the battery compartment is marked with 6-DZM-12, then it is a 36V12AH battery. If the battery compartment is marked with 8-DZM-12, then it is a 48V12AH battery.

[AngeloMarie]

Battery size and model mainly depend on two key indicators: capacity and dimensions. The capacity unit is ampere-hours (Ah), for example, 60Ah means the battery can discharge 60 amps continuously for one hour. When I replaced my car battery last year, I did my homework—ordinary sedans usually use 55-70Ah, while SUVs may require larger capacities. Dimensions are more straightforward; the length, width, and height directly determine whether the battery can fit into the tray. My neighbor once installed a larger battery but couldn’t close the hood because they didn’t measure the dimensions. Additionally, battery terminal positions can be reversed—if installed backward, the cables won’t connect. In winter, you also need to check the cold cranking amps (CCA); in extremely cold regions, you’ll need at least 500A or higher, otherwise, you might struggle to start the engine in the morning. All these parameters are listed in the vehicle’s manual—it’s always a good idea to check before replacing.