When you wire batteries in a parallel connection, the power remains same, but the capacity increases. So if you took two batteries both 6V (Volt) and 10AH (Ampere-Hour) and wired them in Parallel you will have 6V and 20AH. In simpler words, batteries connected in parallel provide the same power for longer duration.
This kind of parallel wired batteries are used to jump start the car, scooters and it can also be used for laptops and UPS backups. The process of connecting two batteries to be used in a single application is generally known as battery bank.
In order to wire batteries in parallel, connect positive terminal with the positive and negative terminal with negative of both the batteries with a set of cables. You then connect the load with one of the batteries, but both will drain equally.
Both the batteries which are to be wired in parallel must be of same types whether it is lead acid or lithium-ion. Different types of batteries should not be wired together as they could explode. It is also important to note that in parallel connection amperage of the batteries increases, therefore high duty cable should be used to avoid the cables burning out.
When wiring batteries in parallel, try to match the capacities as much as possible to avoid discharging one battery quicker than another. Also age of the batteries should be same, adding new batteries to old will result in old ones pulling the new ones down.
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