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Question about battery voltage

Question to Knivesandtools:

Will my torch shine less if I put other batteries or accumulators in it?

Some torches work on 2 CR123A batteries with a voltage of 3.0 Volt for example. 2 of them provide 6.0 Volt. I now read that 2 of those batteries can be replaced by 1 type 18650 accumulator with a voltage of 3.7 volt. Will the torch then not give less light? We often get the same question for torches that work on penlite-batteries of 1.5 Volt. The rechargeable version provides a tension of only 1.2 Volt and obviously a torch will give less light then.

Answer of Knivesandtools:

The idea that a lamp will start giving less light if the voltage of the batteries decreases, comes from experience with traditional (pocket) lamps whereby a light bulb is directly connected to the battery.
If the tension of the batteries decreases the bulb indeed will shine less bright.

Modern LED -torches are almost always fitted with an electronic power setting. This is an electronic element that transforms the tension of the battery and thus keeping the power supply of the LED (or the power that goes through the LED) constant until the batteries are almost empty.

Modern LED -torches are almost always fitted with an electronic power setting. This is an electronic element that transforms the tension of the battery and thus keeping the power supply of the LED (or the power that goes through the LED) constant until the batteries are almost empty.

So the answer is: No, in many situations the lamp will not give less light if you put batteries with a lower voltage in it. If a torch from our assortment is suitable for 2 types of batteries you can assume it is electronically controlled. That means the light output will not or hardly change if you put other batteries in it.

Make sure you only use the type of batteries indicated by the manufacturer of the torch.