Connect them in parallel. They must be the same voltage and the same or similar amp-hour rating.
A way of connecting batteries together to provide more current is to connect them in parallel. This allows more capacity at the same voltage. If the batteries were connected in series the voltage would be increased.
When you connect batteries in parallel, the positive terminals are connected together and the negative terminals are connected together. This increases the total capacity of the batteries, allowing them to provide more power for a longer period of time.
Batteries are DC current.
Batteries provide Direct Current (DC) while household outlets provide Alternating Current (AC).
Not directing current but DIRECT current, meaning there is no oscillation in the current.
Connect positive to negative, leaving the end positive and negative connections free to power circuits or devices. Connecting batteries in series adds the voltage of the batteries. For instance, connecting three 12v car batteries in series will create a total of 36v, enough for welding.
Batteries and generators provide DC, Direct Current electricity.
They both provide an electrical current.
Connect the two batteries for the voltage needed. If they are 12 volt batteries and the lights are 12 volts, connect the batteries in parallel (negative to negative and positive to positive). If they are 12 volt batteries and the lights are 24 volts, connect the batteries in series (negative of one battery to positive of the other). Run a wire from batteries to first switch, then to two of the lights and the other switch (in parallel). From the second switch run a wire to the third light, then connect all three lights back to the battery.
All batteries provide DC. It does not matter their makeup.
Batteries produce DC because the potential difference is determined by the chemical reaction inside the battery. This voltage is constant.
How Automotive Batteries Create Electrical CurrentAutomotive batteries create electrical current by converting chemical energy stored in the plates and the electrolyte [the Sulphuric Acid in auto batteries] to electrical energy.