There are now a number of low-discharge D-size cells available. These cells are as powerful alkaline batteries, and they hold 85% of their charge for a year.
The highest-capacity D-size rechargeable cells are rated from 10000 to 12000 mAh (milliamp hours).
Here are our recommendations:
The Highest Capacity D-Size Batteries: Powerex
The Most Affordable D-Size Batteries: Tenergy
The Worst D-Size Rechargeable Batteries
I don’t recommend getting Energizer D-Size rechargeables, because they are AA cells that have been repackaged in a D-sized shell!
The Best D-Size Battery Chargers
See our post The Best Chargers For C And D Sized Batteries.