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2. Vacuum tube battery - Wikipedia

   en.wikipedia.org/wiki/Vacuum_tube_battery

   Eveready 742 "A" battery with 1.5-volt Fahnestock clip terminals. The "A" battery is used to provide power to the filament. It is sometimes colloquially referred to as a "wet battery". (A dry cell could be used for the purpose, but the ampere-hour capacity of dry cells was too low at the time to be of practical use in this service.)

3. Deep-cycle battery - Wikipedia

   en.wikipedia.org/wiki/Deep-cycle_battery

   A deep-cycle battery powering a traffic signal. A deep-cycle battery is a battery designed to be regularly deeply discharged using most of its capacity. The term is traditionally mainly used for lead–acid batteries in the same form factor as automotive batteries; and contrasted with starter or cranking automotive batteries designed to deliver only a small part of their capacity in a short ...

4. List of battery sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_battery_sizes

   Used to provide power to the filament of a vacuum tube. B Battery: Eveready 762-S: 45 V: Threa­ded posts H: 146 L: 104.8 W: 63.5 Used to supply plate voltage in vintage vacuum tube equipment. Origin of the term B+ for plate voltage power supplies. Multiple B batteries may be connected in series to provide voltages as high as 300 V DC.

5. HT (vacuum tube) - Wikipedia

   en.wikipedia.org/wiki/HT_(vacuum_tube)

   Other power supplies for vacuum tube circuits include: LT, low tension or A battery, the supply to the filaments or heaters. Early tubes designed for battery operation had 2 volt filaments (for use with a lead-acid cell). Later tubes had 1.4 volt filaments to run from dry batteries. With the introduction of mains powered equipment, indirectly ...

6. List of vacuum tubes - Wikipedia

   en.wikipedia.org/wiki/List_of_vacuum_tubes

   1A7GT/DK32 – Pentagrid converter, re-engineered version of types 1A6 and 1D7-G, designed for use in portable AC/DC/Dry-cell battery radios introduced in 1938. Has 1.4 V/50 mA filament. 1B7-GT – Re-engineered version of types 1C6 and 1C7-G, designed for use in dry-cell battery radios with shortwave bands. Has 1.4 V/100 mA filament

7. History of the battery - Wikipedia

   en.wikipedia.org/wiki/History_of_the_battery

   The lead-acid battery is still used today in automobiles and other applications where weight is not a big factor. The basic principle has not changed since 1859. In the early 1930s, a gel electrolyte (instead of a liquid) produced by adding silica to a charged cell was used in the LT battery of portable vacuum-tube radios.

8. Lead–acid battery - Wikipedia

   en.wikipedia.org/wiki/Lead–acid_battery

   AGM cells already have a high acid content in an attempt to lower the water loss rate and increase standby voltage, and this brings about shorter life compared to a lead–antimony flooded battery. If the open circuit voltage of AGM cells is significantly higher than 2.093 volts, or 12.56 V for a 12 V battery, then it has a higher acid content ...

9. Automotive battery - Wikipedia

   en.wikipedia.org/wiki/Automotive_battery

   A typical 12 V, 40 Ah lead-acid car battery. An automotive battery, or car battery, is a rechargeable battery that is used to start a motor vehicle.. Its main purpose is to provide an electric current to the electric-powered starting motor, which in turn starts the chemically-powered internal combustion engine that actually propels the vehicle.