On Saturday, October 27, 2018 at 4:33:10 PM UTC-4, wrote:
Here is one source for the needed battery cells (with tabs pre-welded):
https://www.batterybob.com/products/...tabs-lith-8-1/

Here is a source for the whole battery pack ready to plug in, $50 - not blessed by the factory:
https://www.ebay.com/itm/ACR-ResQlin...1/332810112016

The price for non-factory-authorized battery is now down to $39:
https://www.ebay.com/itm/ACR-ResQlin...1/332810112016

Or, for $55 they will also do the battery-replacement labor for you, includes shipping back to you:
https://www.ebay.com/itm/ACR-Resqlin...5/332852007531

Note: I am not affiliated with this seller, and have not used their service. If anybody does deal with them, let us know how it went.