Curenta 12V 100Ah lithium battery supports parallel connection to increase battery capacity. The following is the operation guidance of how 2pcs 12V 100Ah lifepo4 batteries in parallel connection: Firstly, prepare the parallel connection wires. Then connect the battery 1 positive to battery 2 positive battery 1 negative to battery 2 negative. Then the parallel connection is finished. With parallel connection, 2pcs 12V 100Ah single battery is becoming a 12V 200Ah rechargeable battery system.