Wireless mouse will not connect

If your Apple wireless mouse, keyboard, or trackpad isn't working as expected - Apple Support

If all the above steps fail

• Plug in a usb keyboard and mouse
• Un-pair the wireless keyboard and mouse.
• Turn Off Blue Tooth
• Restart in Safe Mode
• Restart Normally
• Turn on Blue Tooth
• Re-pair the wireless keyboard and mouse.

I have a Apple magic mouse 1 and when inserting your AA batteries into your battery slots always with a very soft rag rub the ➕ and ➖ where the battery sits because AA batteries leave battery residue on the contacts. If it is not clean then your wireless mouse will not connect then clean off the battery residue then your wireless mouse will work. I use Duracell AA batteries and it's guaranteed 10 years. I also use a battery tester to see how much charge is still left in my AA batteries. It will tell me when to replaced if it is in the red and if it is in the green then it is still good. This battery tester has save me lots of money. Before I used AA batteries I purchase Apple rechargeable batteries and I charge it for the time allowed for full 100% charge. After charging I used my battery tester and it read only 1% charge left in my rechargable battery and took it back to Apple and got another set of rechargeable AA batteries and charge it again for a full charge and tested the AA batteries and it had only 2% charge left and took it back to Apple for a full refund.