A lot of misinformation here. Read this instead:

http://www.luxresearchinc.com/news-a...eases/148.html

Keep in mind also that where there are problems is when recharging, not discharging, so use in gliders is not a problem. Also, most ELTs are shipped with lithium chemistry batteries now and have been used in aircraft in Canada since 2008 so a lot of pilots are already flying with them.