Rate - When applied to cells it usually means the cells current carrying capacity.
Rated capacity - The specified capacity of a battery.
Recycling - Reclamation of materials without endangering human health and the environment.
Reserve capacity - The number of minutes at which the battery can be discharged at 25 Amps and maintain a terminal voltage higher than 1.75 volts per cell, on a new, fully charged battery at 80degrees Fahrenheit(27C). Defines a battery’s ability to power a vehicle with an inoperative alternator or fan belt. Used for comparing automotive SLI batteries.
Resistance welding - Resistance welding is a process used to join metallic parts with electric current. There are several forms of resistance welding, including spot welding, seam welding, projection welding, and butt welding.
RFI - Radio Frequency Interference. Transmitted/emitted RFI affects other external equipment. Susceptibility measures the immunity of equipment from received RFI. See also EMC