What does this mean?
Connecting your batteries in series will generate a higher voltage. The total voltage is the sum of all individual voltages. Connecting the batteries in parallel will increase the capacity or amp hours. When you connect your batteries in a "string" (either in parallel or series) and find a battery that is not charging properly, we suggest that the entire string be replaced.
You can connect your SLA battery in series or parallel. Connecting your SLA batteries in series will generate a higher voltage. For example, connecting two 12 Volt batteries will give you an output of 24 Volts.
Connecting your batteries in parallel will increase the capacity (Ah). For more information, please refer to ‘Connecting Your SLA Batteries Together’.