Battery Capacity and Battery Cells - Serial and Parallel

Same reason AC power is transmitted at higher voltages. Lower current (higher voltage) usually provides lower I-squared-R losses per unit of power used.

You can design a system (e.g. motor and controller) to run from a 4Vdc 1200A (4.8 kW or ~6.4 hp) source OR you can design a system to run from a 120Vdc 40A source (4.8 kW or ~6.4 hp).

Considering wire size and controlling electronics, which system do you think would be easier/cheaper to build and more efficient to operate?

http://www.amazon.co.uk/Magnets-Batteries-Ladybird-Junior-Science/dp/072140118X

Except for the wire size, its also a matter of preference. If you use an inverter, its always easier to build them to run at higher voltages. This becomes more of a factor at higher capacities. The other issue is granularity. How expensive is it to replace one cell if it fails? Eg... A single cell that's much bigger because you went for low voltage high current instead of high voltage low current for the same Watt hours of capacity.

If you're using the juice directly, motor size shrinks as the voltage increases also.

Basically connecting cells in series increase the voltage of the cell. connecting them in parallel increases amperage (amp hours ) of the cells. So if you have let say 9 3.2V cells (A123 LIFe cells) w/ 1 Amp Hr capacity and you connect 3 of them in series you get a 9.6V battery Battery w/ 1 AmpHr Capacity, now if you do this with the other cells and get 3 9.6V batteries, and connect then in parallel, you would get a 9.6V 3AmpHr battery ( I wish this allowed me to draw diagrams to show it better ). but I think you get the idea HLG

Livagain1,

How about this?

Jon

YUP

Livagain1,

And this:

Jon

Connecting cells in series is not used to increase capacity. The purpose of connecting cells in series is to arrive at the voltage needed to power a particular circuit. You can connect batteries in parallel to increase capacity and leave the voltage alone. This has the same effect as increasing the size of the cell by 2 times if 1 additional battery is used and so on.

Thank you so much for your replies ...no space left for any doubt!! thanks

Key,

Indeed. nicely stated.

Jon

Thanks above answers.If you need cheap laptop battery , http://laptopsbattery.us and http://www.lenovo-batteries.com is good chose .

Battery connecting in serial will get more voltage but same capacity.

Battery connecting in parallel will get more capacity but same voltage.

So, answer to you question is that, you have to connect the battery in parallel to get more capacity.