>There is virtually no batteries without ICs There are after market batteries w/o battery management ICs like TI Gas Gauge, its up to device on whether it will

>There is virtually no batteries without ICs There are after market batteries w/o battery management ICs like TI Gas Gauge, its up to device on whether it will accept a battery without such IC. >that has nothing to do with whether the device runs without a battery. That’s just a design choice I agree that just having a battery without IC doesn't guarantee that the device would function directly with an external voltage regulated power supply, but a device which accepts only the battery with specific IC makes it difficult or even impossible to run the device that way.