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 sit for a year or more.

Centura 9V NiMH Battery by Tenergy

You can find the low-discharge, 200 mAh “Centura” Tenergy 9V rechargeable battery on Amazon, $26 for a pack of 4, including a charger.

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.

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