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It depends on the voltage you wish to use - if the voltage is, say 12 volts (and matches exactly), you could place in parallelel for 12 volt output, and the ability to serve more current. If you want 24 volts, put them in series.
If you do place them in parallel, note the 28Ah battery will discharge sooner than the 40Ah, causing the 28Ah battery terminal voltage to drop, which will cause the 40Ah battery to attempt to charge the 28Ah battery up to the full voltage again.
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∙ 14y ago
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Will a 12v 18ah battery start a engine that requires 12v 40ah?
YES
How long should you charge your 12 volt auto battery 35 amps 13.5 volts DC?
I think you mean 35Ah (Ampere-hours) This depends on the amount of energy that can be stored. The amount of energy in car batteries is usually expressed in Ah, and depends on the voltage of the battery. In Europe, mostly 12V, 40Ah to 70Ah. Let's say a battery of 35Ah 12V (in reality, a fully charged lead-acid battery will have 12,65V over its open poles) needs to be fully charged. 35Ah means tha it can, theoretically, deliver 35A at 12V during 1 hour. That's is a total power storage of 12x35 = 420Wh = 1512kJ (kiloJoules) The amount of current flowing into the battery will charge (by an electrochemical process) the battery. So it's not really the voltage of the battery, but the current that's important. Unless you know the internal resistance of the battery, You can not really calculate this. But now practical. You can charge a car battery at a pretty high current, although quality deteriorates with higher currents (that's why professional chargers will use a pulse charger) , so your 13,5V will not be too high. Car generators can deliver up to 16Volts to a battery. What I suggest is this: measure the battery voltage, load the battery with the 13,5V, and measure again after 10 minutes. Check the voltage of the battery, and do not exceed 12,5V. Even better: Load the battery, and meanwhile measure the current and voltage. Now you can calculate the internal resistance of the battery. A word of caution. Car batteries contain a highly poisonous fluid, a mix of water an sulfuric acid. Don't play around with it, DON'T SHORT IT, don't reverse polarisation, This fluid causes severe burns. Be careful.
What is the battery specification for a Kia picanto?
gasoline engine 1.1 Battery 40 AH Alternator 13.5V 70A Starter 12V 0.9KW dimensions(mm): 187x127x225 SpecificationsVoltage - 12VCapacity - 40AhCCA(EN) - 330Aexample: VARTA, Type 054 Varta Asia Car Battery 12V 40Ah(Short Code: A14)(Varta DIN: 540 126 033)
