It is not possible to compare just a maximum capacity of battery without comparing the price of the battery. The same battery might have the different price in different shop. Price also differs from country to country.
This comparison will show the capacity on the unit of currency. (For example which capacity I get per US dollar) The system contains the purchase price of battery calculated to different currencies according to official exchange rate. If your prices of batteries are different, you can change the price of any battery according to your local price.
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