Lithium (coin cell) backup battery

[Jonathan Busby]

(11-20-2021 06:26 PM)SEasterling Wrote:  Thanks for the replies and sorry for my ignorance using the battery type too loosely. I should have specified lithium coin cell (3V, 2032) and was inquiring exclusively to HP graphing calculators. (I didn’t realize there was a large TI following here since it’s been a long time since I was active on this forum.). But specifically, I was wondering if HP had ever used a “lithium coin cell” for memory backup on any of the 48 series models (e.g., 48G+ or late-production 48GX) before discontinuing production in Indonesia. I know that my 49G+ and 50G models have this extra battery, but didn’t know if HP started doing it on the 48 just prior to ending that series. I know that none of the 48S, SX, G, G+, or GX models I’ve owned didn’t have them, but I may not have had late production models. Thanks.

To the best of my knowledge, none of the Saturn-based S/SX or G/GX models ever used a backup battery, instead, they used a capacitor to maintain the SRAM contents when changing the batteries.

Regards,

Jonathan