How do I make my own laptop Cmos battery

Question

The people on your site helped me find a Cmos battery for my laptop. https://www.ebay.com/itm/NEW-OEM-FOR-HP-Pavilion-dm3-dm3-1100-Series-Battery-Cmos-Resume-RTC-/264449233544

But I realized this battery is probably just as old as my laptop one. So probably not good. So I was thinking I can buy one or two of these and cut and put in a new battery. That way I don't ruin the adapter I have. Plus one or 2 I can practice cutting and adding the new battery.

So how do I make my own? How will I know which battery to buy? Is this a rechargeable Cmos battery so if I put in another non rechargeable one will it cause leaks? How can I find a rechargeable one?

My laptop is a Hp Pavillion Dm3t-1100. Looks like 2007 or 2009 ish. Runs windows 7

Answer 1

Purchase the eBay battery, take it apart (the plastic cover) so you can see how the battery unit was assembled, buy a CMOS battery or 2 of the same type, and re-assemble the unit with the new battery replacement(s). Cover with black tape or shrink wrap, check the voltages at the plug to ensure correct and then put in the computer.