An ordinary LED flashlight, 3W, uses only 1.5V common batteries, and now uses 3.6V's lithium batteries,
Short term use is not representative of what, the overvoltage caused by flow, is fatal to LED, decay quickly formed (brightness down), soon bad
Must use, must be removed or short circuit to the original, but also the series resistance of 25 Ohm, although this effect is still not ideal, the use of lithium battery voltage decreased slightly, due to the resistance divider, LED not very bright. The best of the constant current circuit (resistance will dynamically adapt to changes). An electric charge of LED after work much longer.
.LED can not work voltage about 3.2V, 1.5V battery is through the frequency conversion step-up circuit, the voltage 1.5V rise to about 3.2V power supply. Directly with lithium battery replacement, LED directly burned, boost circuit is difficult to say
