Failed battery starts to endanger substantial amounts of data (9)

I believe the answer is:

terabytes

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'amounts of data' is the definition.
'terabytes' can be an answer for 'amounts' (terabyte is a kind of amount). I am not sure about the 'of data' bit.

'failed battery starts to endanger substantial' is the wordplay.
'failed' indicates anagramming the letters.
'starts to' suggests taking the first letters.
The first letters of 'endanger substantial' is 'es'.
'battery' anagrammed gives 'terabyt'.
'terabyt'+'es'='TERABYTES'

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