Cornerstone Products Lite Crochet Hooks, Size H, 5mm, Lavender

Some of the reveiws mention size irregularities, specificaly the the h is at least a j size. i want standard size h 5 should i buy e f g or h?

I wonder about the durability/strength of this type of hook. I mostly make animals/toys (amigurumi) so need a smaller size that will allow me to make

Where do I find batteries for the crochet hooks?

I have these and can’t the batteries to go in them and stay. Any help?