Biblical figure is beginning to cower following battery (5)

I believe the answer is:
isaac
'biblical figure' is the definition.
(I've seen this before)
'is beginning to cower following battery' is the wordplay.
'beginning to' suggests taking the first letters.
'following' says to put letters next to each other.
'battery' becomes 'aa' (I can't justify this - if you can you should believe this answer much more).
The initial letter of 'cower' is 'c'.
'c' after 'aa' is 'aac'.
'is'+'aac'='ISAAC'
Can you help me to learn more?
(Other definitions for isaac that I've seen before include "Father of 21" , "Boy's name" , "Jacob's father" , "Sarah's son" , "one almost sacrificed" .)
