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 unsure of the 'of data' bit.

'failed battery starts to endanger substantial' is the wordplay.
'failed' is an anagram indicator.
'starts to' suggests taking the first letters.
The initial letters of 'endanger substantial' is 'es'.
'battery' is an anagram of 'terabyt'.
'terabyt'+'es'='TERABYTES'

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