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Q:

on dashboard battery shows up on 2000 Toyota Sienna

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
a small battery shows up on the dashboaed and stays on
(2) Answers
There is a problem with the charging system. Looks like the alternator is bad. Don't drive the car in this condition, when the battery drains you will stuck. Call a tow truck and get it towed to a shop.

Zee
this means there is a problem in your altenator, there is a rectifier or diode assy that is letting power flow the wrong way wich inturn turns on the battery light, or maybe the internal voltage regulater is bad