When i leave my car parked and off for more than a month i often have to charge/replace the battery. However when i disconnect the battery it somehow lasts way longer. I cant think of anything that is on all the time when my car is parked (no alarms, remotes)
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Your car probably has remote central locking. This means there is a small computer in your car that is running constantly, waiting for the signal from your remote so it can activate the door locks.
Alongside this you may have features like alarm systems, or other features that will be constantly using a small amount of power.
There are also things like some batteries having a small amount of self discharge, or being affected by extreme cold or heat that will cause them to slowly use power, or an older battery having less capacity due to wear.
Add all of these things together and your battery will be slowly discharging over time. Normally this isn’t an issue, as every time you drive the battery is topped up, but left stationary long term this can cause issues.
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