In a lead-acid battery we have 6 cells, each cell having positive and negative terminal. The negative terminal of the first cell from the right of the picture connected to the positive terminal for the second cell, and so on. This mean that I connect the cells in series. Is it correct?

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Could these cells be connected in parallel? If I connect them in parallel, I will get 2V, but the amperage should increase. Is that right?

  • 2
    \$\begingroup\$ You won't be able to put the cells of a general purpose SLA in parallel \$\endgroup\$ – PlasmaHH Dec 7 '16 at 15:23
  • \$\begingroup\$ and if i connect them in parallel i will get 2v but the amperage will increase You mean the maximum current increases: yes that is true. But as others also say: you cannot and should not try to do this. Why not ? Because SLA batteries can deliver insanely high currents already. Slight differences in voltages can make huge currents flow, damaging the battery and maybe the user as well. \$\endgroup\$ – Bimpelrekkie Dec 7 '16 at 15:31
  • \$\begingroup\$ @PlasmaHH. This is not true. Parallel connections are used to build large scale packs. This is done in trucking and marine applications all the time. \$\endgroup\$ – Jack Creasey Dec 7 '16 at 15:32
  • \$\begingroup\$ @JackCreasey Sure, but that would be done/build at the factory or during installation right ? By professionals who know what they're doing. Or maybe these are oldfashioned type SLA batteries which are connected but then filled (with acid) later ? \$\endgroup\$ – Bimpelrekkie Dec 7 '16 at 15:34
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    \$\begingroup\$ @JackCreasey: I have yet to come around and find an SLA where the assembly that connects two cells is not a solid chunk of lead or other metal that is hanged over the seperating plastic between the cells. I am however looking forward for your instructions on how to put these in parallel. \$\endgroup\$ – PlasmaHH Dec 7 '16 at 15:36

You are correct.
You connect battery cells in series to increase the voltage. You connect battery cells in parallel to increase current capability.

There is no problem with either series or parallel connection.

Rules About Battery Configurations
When configuring batteries in Series or Parallel; batteries should match Voltage, Capacity, State of Charge and Relative Age for safety and best performance.

Series - In Series configuration or series leg of series/parallel configuration, batteries should be as identical as possible.

Parallel - In Parallel configuration or parallel legs of series/parallel configuration, battery voltages MUST be identical, but battery capacity, state of charge, and relative age can vary moderately from one parallel leg to another.

Connection Engine Cranking Batteries the CCA (cold cranking amps) are multiplied by the number of parallel connections. This is also true with amp-hour capacity in deep cycle application.

  • \$\begingroup\$ so actually they connect the positive terminal of one cell to the negative terminal of the other cell and from this combination i can get 12v \$\endgroup\$ – M.R Dec 7 '16 at 15:54
  • \$\begingroup\$ Yes - A 12 volt lead-acid battery consists of six 2 volt cells connected in series. The same technique can be used with other types of cell to make a higher voltage battery. The common 9 volt rectangular battery consists of six 1.5 vot cells in series. \$\endgroup\$ – Peter Bennett Dec 7 '16 at 16:50

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