The E-Ink 4 Plus has a 2,000 mAh battery and the device weighs about 100 grams. The smaller E-Ink 4 has a 1,000 mAh battery and it weighs about 70 grams. Apparently there's a variant with 4G wireless and a 2MP camera, but it doesn't look like it's available yet.
My note
I really like this guy.
New Metalio E Ink 4 Plus has 4.7″ Screen with 297 PPI · The eBook Reader blog.the-ebook-reader.com ↗