Rechargeable AA or AAA Battery USB Charger with Cable/Adapter and 4 AA Lithium Rechargeable Batteries, Auto-Safety & Over-Charge Protection https://www.amazon.com/dp/B07QYKZCHN/ref=cm_sw_r_cp_api_i_VJrHEb8F7KAND

These are the best deal I see for now.. 21 for a 4 pack