Duracell 18500 3.2-Volt Rechargeable Lithium Landscape Lighting Batteries in the Landscape Lighting Batteries department at Lowes.com
Amazon.com: yxzheng 3.2V AA LiFePO4 Rechargeable Battery Replacement for Solar Lawn Light (4pcs AA Batteries)
Li-ion Battery 1PK 3.2V/800mAh - Gamasonic USA
2x IFR18500 3.2V 1200mAh Rechargeable LiFePO4 Batteries for Solar Lights | eBay
Amazon.com: HiXiMi 3.2V 20Ah LiFePO4 Cell Battery Rechargeable Lithium Iron Phosphate, Support Multiple Series or Parallel, Flat Top : Patio, Lawn & Garden