I’m trying to repair a Chargeasap Flash 2.0 battery pack

I’m trying to repair a Chargeasap Flash 2.0 battery pack
I’m trying to repair a Chargeasap Flash 2.0 battery pack I received in non working order. The pack says it charges to 100% but won’t turn on and resets to 0%. I have removed labels from top and bottom and removed 6 screws from bottom plastic end but can’t seem to get battery assembly to slide out of metal case. Anybody have an idea how to get battery module out of case?

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