It seems the radio control people make wide use of LiPo rechargeable batteries these days. My own experiences go back to 2008 with LiIon batteries and these were like little bombs if not carefully charged and maintained.
It taught me a lesson: never leave a LiIon pack on charge unsupervised. Failures were rare (about 1 in 150000) but if not carefully looked after and charged they could burst into fire. I suspect many laptop manufacturers kept very quiet about failures fearing the costs and damage to reputation of recalls.
I know nothing much about LiPo batteries, but I hope technology has moved on and they are safer.
For rigs like the FT817 and IC-705 I suspect they could make useful external battery packs capable of many hours of use.
What I need are recommendations for LiPo battery packs and chargers, preferably from Amazon Prime rather than eBay. What would you recommend?