Hey Guys. I have a great battery recommendation. I have two P9s that I use and love. I only use 9v battery power. I first purchased rechargeable REACELL 800mAh lithium batteries and was mostly pleased with price/performance. I use the P9s all night on Omni 8 Power level 11. (For those “Spinal Tap” movie fans you know why I turn it up to 11!) The REACELLS would die after about 8-9 hours at that level. Anyway, I just purchased the Kratax 4Pack 850mAh High Capacity 9volt 6F22 Lithium-ion Batteries with Fast Charger and I highly recommend. They last over 18 hours on Omni 8 Power level 11 setting. (I don’t use them that long but I wanted to see if they had longer lasting power so I just left them on until failure) I even tested them 2 nights in a row because I couldn’t believe there was such a performance difference. Both brands fit exactly the same in the P9s. They are a tight fit but not overly so. I also like that the Kratax has a 4 bay fast charger because you only need 1 USB connection as opposed to one for each battery. The charger does not get hot like other brands I have read about. Hope that helps some of you make a battery decision. I have learned a lot on here and wanted to contribute a little back.
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Thanks @BioHack. I had a close look at these on-line, and they seem to be exactly what I would recommend, so I ordered a few from Amazon.
Good recommendation IMO, thanks.