Gadget Reboot
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Description
Varta to CR2032
Replace old leaking Varta 3.6V NiCd batteries in old computers and other retro devices that used them for battery backup.
This pcb uses a vertical CR2032 battery socket and
- 1n5711 schottky diode (low reverse leakage current)
- LM66100 ideal diode (two silicon parts for safety redundancy)
This prevents the motherboard from trying to charge the battery, allowing the battery to provide backup power to retain settings.
Depending on the motherboard, the battery may or may not also be able to properly retain the clock/calendar settings, but retaining CMOS configuration at least can be very helpful on some motherboards when using them for a while and not wanting to re-enter the configuration on every cold boot.
Schematic and Layout
Design files
https://github.com/GadgetReboot/Varta_To_CR2032
Mar 14,2023
2,640 views
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Varta to CR2032
Replace old leaky 3.6V Varta NiCd batteries in old computers with a CR2032 coin cell
2640
12
3
Published: Mar 14,2023
Download Gerber file 46
BOM(Bill of materials)
Centroid file
PCBWay Donate 10% cost To Author
File Last Updated: 2024/04/23 (GMT+8)
File update record
2024-04-2320:40:50
Centroid file is updated.
2024-04-2320:40:50
Parts List (BOM) is updated.
2024-04-2320:40:50
Gerber file is updated.
2023-03-1510:39:23
Parts List (BOM) is updated.
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Hi, a hobbyist here (so take my response as non-authoritative) :-) I just read the datasheets for the recommended 1N5711 Schottky diode and the max reverse leakage current is claimed to be just 0.2uA. Varies by manufacturer, but not too much. And even that is at 50V reverse voltage. At 2V, which will be just about the maximum reverse voltage in this case, I assume it will be much smaller. So - according to this, looks safe...? Moreover, I'd be afraid that with 0.72V forward drop of 1N4148 or similar diodes, the resulting 2.3V may not be enough to supply the CMOS and RTC, given that the original battery was specified at 3.6V (meaning that it could easily give 4V when fully charged). I am about to build a few of these for myself for a few old motherboards, so I may try using a 1N4148 in one, and see if the voltage will suffice.
Would a simple solution be to use a LIR2032 than can accept being charged at 17ma?