I use this rechargeable 9V battery into a microphone Rode VideoMic Pro. Its lifespan is between 20 and 30 hours, difficult to establish with accuracy. But that's enough for my use. I recharge the battery with a slow charger (13mA), so it takes me about 24 hours to fully charge. She does not seem to discharge too quickly if it is not used for several weeks. I of course always an alkaline battery in case. This product is good and profitable given the price of the 9V battery if one has frequent use.
