- The best low-discharge 9V rechargeable is: Tenergy Centura 9V 200mAh Low Self-Discharge NiMH Rechargeable Batteries
- The best lithium-ion 9V rechargeable is EBL 9V Lithium Ion Batteries
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 sit for a year or more.
Centura 9V NiMH Battery by Tenergy
9v Lithium Ion Rechargeables
You can also get Lithium Polymer 9v rechargeable batteries that use a new gel-type electrolyte. This gel has an energy density of 20% more than typical lithium-ion batteries (550 mAh in capacity). They also last 2 to 3 times longer than rechargeable 9V NiMH batteries, and they hold their charge longer.
There are available here: EBL 9V Lithium Ion Batteries
See also our review of this year’s best rechargeable AA NiMH batteries and chargers.