If you want to connect two (or more) lithium batteries in parallel, connect all positive terminals (+) together and connect all negative terminals (-) together, and so on, until all lithium batteries are connected. Why do You Need to Connect the Batteries in Series or Parallel?
When batteries are connected in series, the voltage increases. When batteries are connected in parallel, the capacity increases. When batteries are connected in series/parallel, both the voltage and the capacity increase. Single battery. Two batteries in series. Two batteries in parallel. Four batteries in series/parallel. Four batteries in series.
The main difference between the series and parallel connection of lithium solar batteries is the impact on the output voltage and battery system capacity. Lithium solar batteries connected in series will add their voltages together in order to run machines that require higher voltage amounts.
You cannot wire the same batteries in series and parallel as you would short the system, but you can wire sets of batteries in series and parallel to create a larger battery bank at a higher voltage. Is it OK to charge 2 batteries in parallel? Connecting in parallel stacks up the amp hours of each battery, allowing for a longer use.
Flow batteries and other chemistries. These are commonly available in 48V. Multiple batteries can connect in parallel without any issues. Each battery has its own battery management system. Together they will generate a total state of charge value for the whole battery bank. A GX monitoring device is needed in the system.
Create Series Pairs: Connect two batteries in series by soldering the positive terminal of the first battery to the negative terminal of the second battery. Do the same for the other two batteries. Combine Series Pairs in Parallel: Solder the positive terminals of both series pairs together using a wire.