The batteries can be charged all the time to be used only as a backup when the power goes out.?

Charging depends on what type charger you have. If your charger charges 100 % then stops, then the batteries can be left in the charger. I caution against buying these batteries because they have a larger circumference.

Color Name	green
Batteries Included	Yes
Batteries Required	No
Brand	Amazonベーシック(Amazon Basics)
Manufacturer	Amazon
Item Model Number	210AAHCB
Size	24個
Product Dimensions	0.56 x 0.56 x 5 cm; 28.35 g
Item Weight	1 Ounces

Amazon Basics 24 Pack Rechargeable AA NiMH Batteries, 2000mAh, 1.2V, Up to 1000X Charge, Pre-Charged

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