Alternating current; current flows in both directions. 

Compound in a battery that promotes electrochemical reaction. (in Lead-Acid Chemistry)

Absorbent Glass Mat is a lead acid battery that uses a glass mat to promote the recombination of gases produced by the charging process.

Ah is a unit of charge. Example: Drawing a current of one ampere (1A) from a battery for one hour (1h) means battery capacity is one ampere-hour (1Ah).

Electrode on which oxidation occurs; releases electrons on discharge. When applying power to a device (vacuum tube, diode, battery on charge), the anode is positive; taking power away on discharge turns the anode to negative.

Used in lead acid batteries to improve mechanical strengths of lead plates and enhances performance. Other uses are flame proofing, producing low friction applications, and building semiconductors.