Looking for an anti-virus software that won’t drain your battery life too much while scanning? I would suggest a low resource AV like Avast or better yet use a cloud antivirus solution that does all the hard work in the cloud. Panda Antivirus has great cloud powered anti-virus for personal use and for business use, you should consider BitDefender both have cloud antivirus solutions.
Below are ones you should avoid if you want to keep tings light resource usage.
ClamWin – high false positive rate, no real time/on access scanning, VERY slow to scan
PCTools Antivirus – EXTREMELY slow to scan, and somewhat of a resource hog