Its built - in lithium polymer battery works for non-stop 30 hours when fully charged and you can use any USB connector to charge when required. (indabaa.com)
The real - time images provide a new way to learn how batteries work, and how to improve them. (sciencedaily.com)
If the e-book reader switch on, and the new battery works - that on it all. (e-ink-reader.ru)