https://thenextweb.com/insider/2019/12/04/amazon-launches-a-portable-echo-speaker-for-india/

Amazon has just launched an Echo speaker with a battery pack in India. The device, called the Echo Portable Speaker Edition, is priced at Rs. 4,999 ($69.70).

The new Echo device has a 4,800 mAh battery that can last up to 10 hours in a single charge.