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I ordered a Panasonic BR2032 based on this guide. It took 3 weeks to get it because the company sent a CR2032, and I made them take it back and send a BR. BR2032 in hand, I opened up my EMC 2133 iMac and discovered the PRAM battery was actually a CR2032. And it's a Rayovac (unless I mixed up my batteries). And actually the problem wasn't the PRAM battery, it was a bad cap (420v, 150μF) on the power supply. I just replaced the capacitor, and now I'm wondering: does the brand or chemistry of the PRAM battery even matter? It's hard to find a real answer. It would be appropriate to have that information here.