Amazon with TIGER HEAD HI WATT BATTERY HK CO LTD has the 4-Pack HW 2800mWh Rechargeable AA Lithium Batteries w/ Micro USB Cable for $9.99 - 5% off with Subscribe & Save (can cancel at any time) - $3 off with coupon code 5CXXH2NE at checkout = $6.49 with free shipping on $35+ or with Prime.