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what battery 12 -18 volts to feed audio recorder

Hi, i own a fostex pd6 and need to purchase a battery system to feed it, i am uusing actually the low cost lead acid 12 volts battery, but they are heavy and have a short life, and not relialable

I have been suggested a system based on IDX with vmount and XLR 4 pin i was wondering if could find someting cheaper,
anyone of you has a similar experience?

Do battery voltages spike near end of life?

During a production, a wireless mic required "0" input gain at the console preamp and still had plenty of signal in the level meter (acting like a line-level input requiring -20dB PAD). Very odd. Then, the batteries died. Once they were changed out of the transmitter, the gain staging went back to normal and (as it should) the mic required input gain on the console to get good levels.