What is the effect of connecting batteries in parallel?

Connecting batteries in parallel primarily increases the current available to the circuit. When batteries are connected in parallel, their voltages remain the same, but the capacity to supply more current increases because the total current output is the sum of the currents from each battery. This configuration is particularly beneficial in applications requiring higher current loads, as it allows for longer run times and greater efficiency without increasing the voltage level, which would happen if batteries were connected in series.

While connecting in parallel does not inherently change resistance, it can effectively reduce the overall internal resistance seen by the load, which may allow for improved performance under load conditions. However, the significant advantage is the augmentation of current capacity, making it suitable for applications that demand higher energy output.