Rechargeable 9 Volt Lithium Polymer Batteries: Efficient »» MetaEfficient Reviews: "When buying 9 volt batteries, you might want to consider a rechargeable Lithium Polymer 9 volt batteries. As far as I know, iPower is the only company that makes rechargeable 9V lithium polymer batteries. Their batteries are the same size as a 9 volt alkaline battery.
They also have approximately the same capacity as an alkaline 9V–the iPower lithium polymer is rated at 500 mAh, and the “professional” version is rated a 520 mAh. They will actually outperform a 9 volt alkaline battery in high drain applications.
Lithium Polymer batteries 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."
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