Light having a circuit accommodating batteries of different types and/or sizes

An electronic circuit for determining a type and/or size of a battery in a portable light and controlling an operating condition of a light source of the portable light comprising:

• a circuit measuring the voltage of the battery when the battery is in the portable light;
• a processor for determining the measured voltage of the battery at a first time;
• said processor comparing the measured voltage of the battery at the first time and a predetermined voltage value;
• and
• said processor setting an operating condition of the light source based upon the difference between the measured voltage of the battery determined at the first time and the predetermined voltage value.

A method for determining a type and/or size of a battery in a portable light and controlling an operating condition of a light source of the portable light comprising:

• measuring the voltage of the battery when the battery is in the portable light;
• determining the measured voltage of the battery at a first time;
• comparing the measured voltage of the battery at the first time and a predetermined voltage value;
• and
• setting an operating condition of the light source based upon the difference between the measured voltage of the battery determined at the first time and the predetermined voltage value.