Battery is a device which contain two or more cell and used to convert chemical energy into electrical energy.
Sluggish engine behavior (which makes it difficult to start the vehicle on cold mornings).
Inconsistent vehicle starting, absence of sound or interior lights when attempting to start the vehicle, electrical draw, or loose/corroded connections.
One of the common sign of weakening battery is that the interior lights could be seem more dimmer than normal.
The vehicles have some visual sign to show the weakening condition of battery. So if there is visual sign of dashboard warning light then the battery condition become worst.
It there are some weird things happening with your electrical board like wiring then it's a problem of electrical malfunction which will worsen your car battery condition.