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13 votes
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Nearly drained battery for 2 weeks - how much damage was done?

Considering car batteries usually have a lifespan of between 3-5 years, I'd say "yes" you should probably think about getting a new battery. As far as damage to the battery, you should have ...
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4 votes
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Question about cigarette lighter voltages/currents

It depends on the efficiency of the electronics inside the charger. Presumably it will be some kind of switching regulator that will be fairly efficient. Your calculations are correct for 100% ...
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3 votes

Nearly drained battery for 2 weeks - how much damage was done?

TL;DR Keep using it till you can no longer use it if you're not afraid of getting stranded somewhere; it's a $150-$250 investment depending on your engine size. A 5 year old car battery has lived a ...
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3 votes

Car starts only when I jump it

You have listed the obvious reasons your car is not starting. I would suggest starting with a visual inspection of the the battery terminals and cable connectors to see if they are clean and are ...
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1 vote

If a battery has a date of manufacture stamp of 2016 on it and will not charge, is it expired? Yuasa NP17-12L. I think I’m being conned. Help!

If a Sealed lead-acid starter battery was sitting around on a shelf for 6 years and never used or maintained, it could be dead. Symptom would be that it shows ~13V or so, but any load and it just has ...
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  • 2,537
1 vote

2012 Sonata doesn't turn on but make hosh sound

The sound you are hearing is the starter gear spinning and not engaging the flexplate and therefore the engine will not turn over and start the car. This could be caused by a couple of things. Most ...
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1 vote

Car starts only when I jump it

Can you go into a bit more detail about exactly what it does when you try to start it on the key? Traditional starter motors need a small current from the battery to the key to the starter's solenoid. ...
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  • 2,537
1 vote

2000 Suzuki Katana 600 starting

Always start with the basics. To run an gasoline internal combustion engine requires: Fuel Air Compression Ignition First of all this bike has carburetors and these can be very sensitive to storage ...
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  • 8,589
1 vote

Nearly drained battery for 2 weeks - how much damage was done?

You never had a charging problem. The charging system worked as intended. The lead-acid battery has simply reached that age, and is due for replacement. It doesn't owe you anything. Yes, you did ...
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