![]() The only one that usually will, are the ones that can use both. Having said that though, single AA lights WILL NOT list voltage limits. I recommend reading the manufacturers specifications carefully, which should indicate the working voltage range. In that case, the advertised lumens will be LESS, since it’s INTENDED for 1.5 volts. A flashlight that is specifically intended for ONE 1.5v battery, can usually accept a 3.7v as well. Naturally if the light was made to be able to accept 3.7v, the higher lumens the voltage offers, will be its main selling point. The only reason for using a 14500 in a flashlight is for higher lumens. Therefore, ONE 3.7 volt battery is okay, but TWO of them, at 7.4 volts is too much voltage! It would physically kill the flashlight to feed it that much power! ![]() This is due to the voltage limitation of the light, which typically will have a limit of 4 volts. On the other hand, flashlights that use TWO AA cells, CANNOT accept 14500 batteries. ![]() Most flashlights that run on ONE AA cell, can also accept a 14500 lithium battery. Let me expand on the whole flashlight thing. In fact, of all the gadgets I own that use AA’s, an LED flashlight is the ONLY one that can accept it…and the only one that actually benefits from it. What is absolutely essential, is that the device you’re looking to use a 14500 in, be able to accept a 3.7 volt battery!! The list of devices made to operate on a SINGLE AA (1.5v) battery, which can also accept a 3.7v lithium, is very limited.
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