Although informally called a battery backup, formally the type of product we're looking at today is called an Uninterruptable PowerSupply (UPS). A UPS unit is similar to but different from a surge protector. Related: You Need an Uninterruptible Power Supply (UPS) It's one part surge protector and one part beefy battery. .
You'll find plenty of recommendations to put a UPS on your computer, especially if you're doing mission-critical work or have expensive hardware to protect, but there's not as much talk. .
In our guide to selecting a UPS for your computer, we take a deep dive into the ins and outs of calculating power loads and UPS sizing.
[pdf] To backup an RTCC or SRAM, two cells in series are needed to get 2.4V. Standard AA and AAA cells are popular and easy to be changed, but they need a battery holder.
[pdf] To access your best friends list on Snapchat Plus:On the Snapchat app, swipe to the left or tap the Chat icon to access your chat.Tap on the 3-dot icon and select Manage Friendships.You will see your best friends' list under the section Best Friends1.As a Snapchat+ subscriber, you can view up to 16 best friends on your friends list. To check out your extended Best Friends List, go to your Profile, tap your Snapchat+ membership card, then tap 'Extended Best Friends List'2.
[pdf] 
