Battery backup is often overlooked in smoke detectors, yet it represents one of the most important small features to consider. Plenty of smoke detectors rely on AC power. This is a solid option, but what happens if you experience a power outage? Unexpected situations arise when least expected. With these aspects in mind, get a model with batter backup. Check batteries on a regular basis too, not to mention replacing them as required. Luckily, there are more models with this feature, so you will have to search a bit deeper. Visit http://www.groundedpower.com/smoke-detectors/ and go through a few reviews before spending your money.