Jimmydz

(Lipo) is still a lithium cell and the same rules would apply. lipos are a completly safe pack tho the only reasons they will catch fire is 1. the pack is damaged in some way (ie punctured and that is ver very hard to do ) 2 its being charged past the recemoned C rating so this kind of stuff wouldnt normaly take place on a aircraft any ways also all new mobile phones have lithium packs.... just my 2c

Air nav free does ground speed

if you dont already have a iphone 4 its will worth a look at ....The camera in them is Awesome!! Only 5mp but still takes some great shots, also the ease of use only one button and tap to focus what more could you want. oh and its a phone too :D