Recs.
Updated
The Epson ES-300W is a fast and accurate portable scanner that comes with a battery and Wi-Fi built in. It particularly excels in text analysis.
SpecsUpdate
Pros
Pro Great for accurate text analysis
The ES-300W comes with ABBYY software, meant for turning your paper documents into editable text. Scanners don't always read the text correctly, some of them only get 3/4 of the words right. This model was tested and didn't make a single mistake - it read 100% of the words correctly (according to Wirecutter's tests). It's capable of reading fonts down to 4p in size, with a few mistakes when reading smaller fonts. If you scan documents with font sizes 6p and up, you will not have to make any manual corrections.
Pro Very portable
The ES-300W fits in a small bag and is easy to carry around. It measures only 11.3" x 3.5" x 2.6". However, it weighs 2.9 lbs, which is a bit heavier than some other models that don't come with a battery. You can choose to power it by AC, built-in battery or USB, so you can use it practically anywhere, without having to worry about the availability of a power supply.
Pro Very fast scanning
At 200 PPI(pixels per inch) scan quality, the ES-300W can scan 23 pages per minute according to Wirecutter's tests. This is 3 times faster than the average portable scanner.
Cons
Con Handles receipts poorly
Epson's scanning preset called "receipt" gives you a scan error when the receipt is longer than 11 inches. Also, the scanner does not come with receipt management software, unlike some other scanners, so if you need one, you will have to look for a third-party solution, like Expensify.