Button cell voltages

ReKleSS · Post by **ReKleSS** » Thu Feb 14, 2008 3:38 am

I grabbed a pile of CR2032 batteries on ebay for my DC, saturn and SNES carts. Can anyone say how low the voltage has to drop before there's a risk of the memory disappearing?

RGB · Post by **RGB** » Thu Feb 14, 2008 10:11 am

SNES carts use various size srams (6216/64/28/256) to hold the data. From what I've learned the data should still be valid on them at a minimum power supply voltage of 2.0 volts.
Same thing applies to the DC and SAT if they use similar/same memories.

ReKleSS · Post by **ReKleSS** » Thu Feb 14, 2008 12:46 pm

Strange, my unreliable Kirby's Super Deluxe cart was still at 2.5V. Oh well, the new battery should last for a few years.

Post by **system11** » Thu Feb 14, 2008 12:58 pm

The voltage is not a good guide on how good a battery is. Lithium cells don't degrade gracefully, they hold their voltage pretty well for the duration, then suddenly drop out.

PC Engine Fan X! · Post by **PC Engine Fan X!** » Fri Feb 15, 2008 11:32 pm

I can attest to inserting an official SNK branded CR-2032 button cell battery into the SNK Neo-Geo Pocket Color handheld in April of 2000 and it lasted until about April-May of 2005 before the red LED indicator told me to replace it before "immenient game memory back-up is lost". I replaced the aging SNK branded 2032 battery with a fresh one and it's been a solid performer since then... ^_~

PC Engine Fan X! ^_~