Question

What is the cold rate of a battery?

(a) Lasting power of a battery on a small load

(b) Rate of current for 20 minutes with a minimum cell voltage of 1.5 V

(c) The current which the battery can supply continuously for 30 seconds with minimum cell voltage 1.2 V

(d) Time for which the battery can supply 25 A at 80℉ with minimum cell voltage 1.75 V

The question was asked during a job interview.

This intriguing question originated from Storage Batteries topic in division Nonconventional Engines, Conventional Energy Sources & Cooling System of Automobile Engineering

Answer 1

Right option is (c) The current which the battery can supply continuously for 30 seconds with minimum cell voltage 1.2 V

Explanation: It is a measure of the worst conditions under which a battery is expected to deliver current, e.g., during starting the engine and operating under extreme cold. The cold rate of a battery is the current which the battery can supply continuously for 30 seconds with minimum cell voltage 1.2 V.