Look under it - there is a battery sitting there. It's a very small 1.5 V battery. My original battery was a "Vinnic L521F". So I thought, what if I just replace the battery? Did not find the exact same brand, but a GP watch battery type SR63. Same physical dimensions and same voltage. I placed the new battery in the holder and then pressed the chip back into place.
That is because the printer is registering the new one and all it's information. This is a common workaround for resetting cartridges as well.I have a workaround for this. I replaced my "empty" (but far from empty) cartridge with a new one. Closed the cover and let it register then took it out and put the old one back. Seems to work fine.
I just wanted to chime in and say that replacing the small batteries in my non genuine Brother toner cartridges did work as GOGS instructed. I have a Brother MFC-L3750CDW printer and the non genuine toner cartridges use a Vinnic L521F battery. I will say that finding the exact brand battery was a little challenging. Amazon did have them but it took about two weeks to get them delivered.
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