MaximalPower 9 Volt Li-Ion Rechargeable Battery HIGH CAPACITY 550mAh 9V Block Amazon.com is the only authorized dealer selling MaximalPower brand products. Please make sure your item is ONLY sold and shipped by Amazon.com! All other marketplace vendors are selling counterfeit products that do not perform the same, and/or are not covered by our MaximalPower Warranty Amazon.com is the only authorized dealer selling MaximalPower brand products. Please make sure your item is ONLY sold and shipped by Amazon.com! All other marketplace vendors are selling counterfeit products that do not perform the same, and/or are not covered by our MaximalPower Warranty. Replacement battery for 9V alkaline batteries Chemistry: Li-Ion, Output Volts: 3.7V HIGH Capacity: 9v 550mAh (Will NOT affect battery compatibility) Absolutely no memory effect so that you can charge battery at anytime. Integrated microchip prevents overcharging & lengthens battery life! 100% Compatible with original manufacturer equipments.