I am using a battery from Amazon, "12V 6Ah LiFePO4 Battery Pack LF4011, 2000 Cycles Rechargeable 12.8V 76.8Wh Lithium Iron Phosphate Battery with 14.6V Charger" It's about $50 and way too big for a QCX and an amp. If I have known more, I would have gotten one half the size. I strongly recommend the LiFePO4 chemistry. It has great properties.
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Colin - K6JTH?
Colin Kaminski