That should be fine 380w is plenty of power for most people. I stillhaev the stock battery in my car and am running well over 1500w  Leave the battery alone.
'98 E0 T-RED CONTOUR SVT
#558/6535
Got Tunes:
Sony CDXC-90, CDXT-65, XDP210EQ
MCINTOSH MC4000M
BOSTON PRO 6.5 COMPONENTS
BOSTON PRO 12.5 LF
POLK DB4500
STINGER 1FARAD CAP
RED NEON INSIDE AND UNDER
THROTLE HANG FIX
RESONATOR REMOVED
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