mA - MilliAmp.

mAH - Milliamp-hour.

MCA - marine cranking amps.

Maintenance-Free Battery - A battery that does not require water addition under normal service conditions. Both positive (+) and negative (-) grids are made of lead/calcium.

Marine-Cranking Amps (MCA) - A rating that is used to define the number of amps that a lead-acid marine battery at 32°F (0°C) can deliver for 30 seconds and maintain at least 1.2 volts per cell (7.2 volts for a 12-volt lead-acid battery). This artificially high rating should not be confused with CCA.

Memory Effect - A condition that is created when a NiCad or NiMH battery is partially discharged and recharged repeatedly, causing a loss of capacity.

MilliAmp (mA) - One one-thousandth of an amp.

Milliamp-hour (mAH) - One one-thousandth of an amp-hour.

Miniature Battery - A button- or coin-shaped battery — i.e., a button cell or coin cell — with a diameter greater than its height. The term miniature is also used to describe batteries made up of miniature cells.

Multimeter - Also known as a volt-ohm-meter (VOM), it is an instrument designed to do a variety of electrical testing, including voltage, amperage and resistance.