I use these for In-Ear Monitor Wireless Transmitter Kits and with this particular shipment I started to worry that my (very expensive!) power was out and I was almost not moving. I borrowed a backpack from bandmates and got very similar results until desperately stuffing the battery with foam to create a stronger connection inside and it all started working MUCH better. Turns out they're a bit smaller than other 9vs, so almost useless to me. Too bad I threw away some of them very quickly after using them "fresh" as they initially felt like they were dead. I would avoid this particular product/supplier in the future.
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