Duracell Duracell Coppertop D Cell Batteries, 4-count Pack, Long-lasting Power, All-Purpose Alkaline Battery for your Devices 004133303361 - The Home Depot
KBS Innovations Lighthawk LED 4 Cell Battery - BrightGuy
Pololu - Rechargeable NiMH Battery Pack: 8.4 V, 2200 mAh, 4+3 AA Cells, JR Connector
Amazon.com: ExpertPower 4 Pack 3.2V 100Ah LiFePO4 Lithium Prismatic Battery Cell | A Grade 2500-7000 Life Cycles & 10-Year LifeSpan | Deep Cycle Rechargeable : Health & Household