Re: 2 amps on one battery?
You should be fine.
Most people don't pull anywhere near rated power. I have three 1000 watt amps on one battery, combined they never pull more than 80 amps when playing music.
Your concern should really be your alternators output rating not the number of battery's.
2001 Honda - 80PRS VS Tube preamp -MS8 - NVX JAD amps - Satori 6.5", Satori tweeters, Rear- Scan 10f, Pioneer TS-W1200Pro
2002 Honda - CZ505 JBL MS8 -SS Ref4.920's - Satori 6.5 - AudioFrog GB25 - SI- TM25 - TS-W1200Pro in progress