I want to do a simple 'test' to see if my motorcycle battery is draining too fast. I've heard that if you keep motorcycle ignition on over night, it will drain. But I could not find any single source where I can get an idea how many hours it will take to drain.
Before asking this question I read this answer from electronics SE.
It means that the battery has a capacity of 25 Ah when discharged in 10 hours. 25 Ah is 25 Amps for 1 Hour which is equivalent to 2.5 Amps in 10 Hours.
So if you load the battery with 2.5 Amps it will last 10 Hours.
If loaded with a higher current usually battery capacity decreases so that is why the 10 Hours is mentioned, it results in a higher battery capacity making the battery look "better".
How many watts: simple 2.5 Amps x 12 V = 30 Watts and that for 10 Hours.
My motorcycle is a small one with 110 cc engine and has following battery specifications:
ETZ5, ATZ5L 12 V-4 Ah (10 HR)
Your vehicle has a maintenance-free type battery. You do not have to check the battery electrolyte level or add distilled water. Clean the battery terminals if they become dirty or corroded.
When I turn the ignition on (not the engine), I think the main things that consume battery are: Headlight (default is low beam), tail light and instrument panel which also have a digital fuel meter and a clock as shown below:
And the information about headlight and tail light:
My bike specifications don't mention the thing I am interested in. So I think I have to roughly calculate it but I'm not sure how to do it.
So is there any way to get rough approximation of how long it would take to discharge battery almost fully when keep ignition on?
I don't need something accurate. If I can figure out something like it should last 2 hours OR 6 hours OR 12 hours OR couple of days (in other words the total time bike ignition on is kept on before it's unable to start the bike), that would help me a lot.
It would give me idea to know that something is not right. For example, the theoretical time is 6 hours and my battery is practically discharging significantly in less than 1 or 2 hours, I would obviously know something is wrong.
PS: If you think there are some other non expensive ways to test health of this kind of battery, feel free to recommend.