![]() With both the nickel strips tinned and the batteries tinned, no flux is required to solder them together. Then wash off the acid flux with detergent and warm water and an old tooth brush. Removing the CMOS battery erases the BIOS settings Ensure to replace with a brand new battery. See the documentation of your Dell desktop for model-specific information. Dell desktops use CR2032 coin cell battery (see the markings on the battery). To keep the heat transfer as low as possible, I use a hot tip and quickly tin the cell terminals and quickly wipe them with a damp sponge or rag to pull the heat away. Replace the battery with the exact same type of coin cell battery. I believe the cross section of the soldered joint provides a better electrical connection than spot welds. Do NOT try to solder that CMOS battery Now put it back in, boot up and set date/time in BIOS. Fully cover all the metal from the CR2032. Use some scotch tape or electricians tape and put it on as tight as you can to keep those contacts in place. It have used it to solder nickel strips to NiCad cells long before lithium cells became readily available and still use it today to replace lithium cells. Make sure that the black flap does not contact the + side. I still have about ¼ of that spool and mostly use it with an old Weller soldering gun (cringe worthy on this forum) that I have a tip dedicated to this alloy solder. Batre CMOS CR2032 / Baterai CMOS Isi 5 pc. I’ve even soldered chrome plated plastic with this stuff. Baterai Lithium Sony Battery CR2032 CR 2032 CMOS Jam Komputer Laptop. ![]() It worked perfectly and I was amazed at how well it wetted alloys that regular leaded solder wouldn’t touch. I think they threw in a bottle of the flux. They recommended this alloy and since it was only available in small lots or a 1 pound spool, I bought the spool for around $40 (this was 1968) now it sells for $150. I went to a welding supply and inquired about the proper solder that was also food grade. ![]() I started using the Sn96/Ag4 solder a long time ago when my next door neighbor had a restaurant and needed a rather large seam in a stainless steel steam table repaired.
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