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.
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The ones with plug in battery are convenient. Brand names are most likely irrelevant. Got mine for cheap off Aliexpress. Due to tariff, the cost is much higher. Screen them by using Amazon reviews. Went thru a lot of batteries with the A9.