The lower voltage battery is not designed to. When two identical batteries are connected in parallel it will double the current capacity and the output voltage remains the same as a single battery.
Series Vs Parallel Battery Systems
Batteries connected in parallel. 1800 mah 12 v are connected in parallel the output voltage of parallel circuit is remain 12 v butt current capacity becomes 3600 mah. Following this example where there are two 12v 200ah batteries connected in parallel we will therefore have a voltage of 12v volts and a total capacity of 400ah ampere hour. My take on it is if two batteries are in parallel and one battery has a cell failure due to plate buckling or collapse the potential of the battery would drop to around 10 volts and the remaining battery in the bank would still have a potential of just over 12 volts so in theory the reverse potential across the failed cell would be just over 2 volts with no charger connected. One 12 volt 150ah battery one 12 volt 150ah battery wired in parallel equals 12 volts and 300 amps. Batteries that are only in series keep the same capacity and increase their voltage. Increasing both voltage and amperage.
Secondary rechargeable batteries these only fair a little better. One 12 volt 10ah battery one 12 volt 10ah battery connected in parallel equals 12 volts and 20 amps. Combining the two provides the best of both worlds. Connecting batteries of different voltages in parallel primary disposable batteries they are not designed to take a charge and so the lower voltage battery is likely to. When you connect two batteries in parallel you are able to double the capacity amperage rating while maintaining the same voltage. For example suppose two batteries of same rating ie.
Batteries that are only in parallel keep the same voltage and increase their capacity. The parallel connection of two identical batteries allows to get twice the capacity of the individual batteries keeping the same rated voltage.
Gallery of Batteries Connected In Parallel
