This is the best rechargeable 16340 battery I could find:
The best 21700 Rechargeable Li-ion batteries are:
These are the best 14500 rechargeable lithium-ion batteries I could find:
Here are my recommendations for the best rechargeable AA batteries:
The Details Low-self discharge 9v Ni-MH batteries have become available in the last few years. The “low-self discharge” label means these batteries will hold their charge for a year, unlike previous NiMH batteries. This makes this 9V battery much more compelling, because 9V batteries are often used in applications like fire alarms, where the battery must
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.