Walmart offers the Tzumi 2-in-1 Wireless Qi Charging Mouse Pad with Rechargeable Wireless Mouse for $10. Opt for in-store pickup to avoid the $5.99 shipping fee. That's $7 off and tied with our mention from ten days ago as the lowest price we could find. The pad can be used as a wireless charging phone stand for all Qi-enabled devices, and it includes a USB charging cable for the mouse.
You very likely are putting your laptop battery into an early grave.