When buying 9 volt batteries, you might want to consider a rechargeable Lithium Polymer 9 volt batteries. There are only a few companies that make rechargeable 9V batteries, the brand I like the most is Maha. They make a 9V rechargeable batteries and chargers, both available on Amazon.

You can also get Lithium Polymer 9v rechargeable batteries, that use a new gel-type electrolyte. This gel has an energy density that is 20% more than typical lithium ion batteries. They also last 2 to 3 times longer than rechargeable 9V NiMH batteries, and they hold their charge longer. See this forum thread with a discussion of the performance of this battery. However, these lithium polymer batteries are expensive, costing $17 each. They are available on Amazon.

Lithium Polymer 9 Volt Batteries and Charger

If you don’t need a lithium polymer 9v, you can also get rechargeable NiMH 9V batteries, which are less expensive and don’t require a specific charger.

See also our review of this year’s best rechargeable NiHM batteries and chargers.