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A "standard" small car battery (whatever that means) has about 45 amp-hour capacity. That is you can draw 45 amperes for one hour, 22.5 amps for two hours, or 0.16 amps for 281 hours or about 11 days. To me this sounds unreasonable. I believe a Volvo battery is much bigger and has perhaps nearly twice this capacity. Are you sure it's 160ma?
I would suggest looking at the charging voltage and being sure that all your cables are absolutely clean - all connections should be polished to a bright metallic shine. Be sure all connections are tight. Don't forget the engine/alternator grounding cables as well.
Do you park you vehicle for long periods of time or do you start/drive it every day?
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