I plan to use the AERO Ni-MH batteries as a backup power. How long will they hold their charge?
This is commonly referred to as the “shelf life” of batteries. For AERO Ni-MH batteries, the shelf life at room temperature is about 70 to 90 days. If you are seeking for longer shelf life, you may wish to consider alkaline or non-rechargeable lithium batteries, which are commonly used for memory backups.