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Question: crash while sleep mode

i experienced sleep crash without power ac. after that using apple hardware test on my mid 2012 macbook pro, i got the following error code: 4bat/6/40000005: 0x8981c990 - what does this mean?

here is my spec

macbook pro 13 (mid 2012) non retina

2.5 ghz intero core i5

8gb ddr3 ram

MacBook Pro (13-inch Mid 2012), macOS High Sierra (10.13.4)

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Question: crash while sleep mode