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Fuel Tank BoosterPack not working

Hi,

 I was wondering if anyone had an experience with BOOSXL-BATTPACK.

I've got one to test it, but couldn't make it to work.

I left the battery to be charge and it never indicates the end of charge. Battery voltage ~4.1V with no load

Then I left if running with Tiva Launchpad for a few hours. The battery went low, battery voltage ~3.6V with no load.

After that it doesn't charge the battery, only indicates battery low.

After connecting to another charger battery starts charging.

What is the trick with that board?

Jan