If they were charged in parallel the one with the high voltage wouldnt get much current and the one with the low voltage would get too much current. To charge two 12 volt batteries in series youd need a 24 volt charger.
Noco Series And Parallel Charging Support
Charging batteries in series. The voltages themselves should add together to equal the voltage of the battery pack source. Charging batteries in series increases the voltage across each battery. Some packs may consist of a combination of series and parallel connections. You need to overcome the total voltage of the series batteries 12 v 12 v 24 v to drive electrons. It is normal to charge lead acid batteries in series. The charger will stop charging when the entire group reaches a certain voltage.
When you charge batteries in series you are charging the entire group of them all at the same time. Laptop batteries commonly have four 36v li ion cells in series to achieve a nominal voltage 144v and two in parallel to boost the capacity from 2400mah to 4800mah. The basic concept when connecting in series is that you add the voltages of the batteries together but the amp hour capacity remains the same. As in the diagram above two 6 volt 45 ah batteries wired in series are capable of providing 12 volts 6 volts 6 volts and 45 amp hours. Thats the pat answer. When connecting or charging batteries in series your goal is to increase the output of your batteries nominal voltage rating.
For example you can connect two 6v batteries in series with a 12v source to recharge them. For the final battery connect the negative end of the battery to the negative output in black of the charger. Then connect the negative end of the battery to the positive end of the next one and continue to do so for the rest of your batteries. Case each charger connects to one battery. To do this you need to connect the pos terminal of the first battery to the neg terminal of the second battery. When you charge in series you connect the negative terminal of the first battery to the positive terminal of the second battery then connect the charger positive terminal to the first battery positive terminal and the charger negative terminal to the negative terminal of the second battery.
As they are used the cell voltages will change which is why they are not charged in parallel. One basic configuration for charging batteries in series is to connect the positive charger output in red to the positive end of one of the batteries. If the batteries are not each at the same voltage this means that one battery is charging higher than the rest and one is not charging as high as the rest. Such a configuration is called 4s2p meaning four cells in series and two in parallel.
Gallery of Charging Batteries In Series
