Rechargeable 6 Volt 4.5AH LiFePO4 Lantern Battery with Charger 1500+ Cycles, 6V Batteries Battery with BMS (Spring Terminals) 1 Pack

Yup. They also make rechargeable for these: https://www.amazon.com/Rechargeable-Battery-Charger-Batteries-Terminals/dp/B0DLK9VG9N?th=1 LFP tech in the rechargeable will mean that they will stay nice and bright and then die with basically no warning, vs Alkaline getting dimmer and dimmer over time.