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2. Battery terminal - Wikipedia

   en.wikipedia.org/wiki/Battery_terminal

   positive on left and negative on the right corner; negative on the left and positive on the right corner. Terminals can also be both on the long or short side of the battery, or diagonally opposed, or in the middle. Purchasing the wrong configuration may prevent battery cables from reaching the battery terminals.

3. Polarity symbols - Wikipedia

   en.wikipedia.org/wiki/Polarity_symbols

   The symbol connected to the dot (usually the symbol found to the right) denotes the polarity of the center/tip, whereas the symbol connected to the broken circle denotes the polarity of the barrel/ring. When a device or adapter is described simply as having "positive polarity" or "negative polarity", this denotes the polarity of the center/tip.

4. Automotive battery - Wikipedia

   en.wikipedia.org/wiki/Automotive_battery

   Car batteries became widely used around 1920 as cars became equipped with electric starter motors. [10] The first starting and charging systems were designed to be 6-volt and positive-ground systems, with the vehicle's chassis directly connected to the positive battery terminal. [11] Today, almost all road vehicles have a negative ground system ...

5. DC connector - Wikipedia

   en.wikipedia.org/wiki/DC_connector

   When installed in a vehicle and attached to a battery, the polarity of the connector is always such that no short circuit will occur if the exposed terminal touches the vehicle chassis. In most vehicles, this means that the exposed terminal connects to the battery's negative terminal. Conversely, the positive terminal on a battery charger is ...

6. List of battery sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_battery_sizes

   This battery contained two independent 4.5 V batteries, and had a four-pin connector. 9 V with a center tap was available by wiring in series. There were two ⌀3.2 mm negative pins spaced 9.5 mm apart and two ⌀4.0 mm positive pins spaced 14.3 mm apart. Negative and positive pins were spaced 18.1 mm apart.

7. Automobile auxiliary power outlet - Wikipedia

   en.wikipedia.org/wiki/Automobile_auxiliary_power...

   For the 12 volt systems, the center contact is the positive terminal and the shell is the negative terminal. Most automobiles connect the negative terminal to the frame of the vehicle (negative ground). 12 volt auto connectors are made to comply with a standard by Underwriters Laboratories for safety. UL2089 was developed to cover the ...