Hot answers tagged

7

All batteries last about the same amount of time, given the same climate and average use. I'm betting the dealership uses a large battery warranty to lure you in to other services, like a "loss leader". It's also common with free oil changes when you buy a car at a dealership. They lose money on the oil change but plan on you buying other stuff at a premium.


6

They may make 100-months guaranteed batteries with higher real capacity than 60-months ones. Higher capacity means that harmful events like overcurrent or deep discharge are less likely to happen, and that a battery still works fine after losing some of its original capacity, because the remaining capacity is still enough to reliably start the car. I would ...


5

The grease is there to prevent corrosion on the battery terminals, when you put the connector on and tighten it down the grease gets squeezed out and what's left prevents corrosion where there's no metal to metal contact. If your battery came greased then there's no reason to clean the terminals unless the grease got rubbed off and the terminals corroded. If ...


3

Don't mistake the length of a battery's warranty with how long a battery will 'last' - it's just a warranty, not a guarantee of performance. So here's how it works: you buy a battery for $100 with a 60 month warranty. In 30 months, it dies. You go back to where you purchased the battery, and you will pay $50 for a new battery - that's called a '...


2

It does appear to be coming out of the wire and I suspect that it's glue or sealant that was put in to keep the elements out of the wire. If that's the whole of it I doubt that it's a problem. My only concern might be a loose connection there on the battery that is causing the terminal and wire to heat up and cause the stuff to bubble out. Check and clean ...


2

The people in the sales/advertising department decide what will sell best. Long ago, the advertising people at Amoco picked some random long life number. To maintain company reputation , about any battery was replaced if a customer complained. When batteries failed and warrentee costs went up , some manager decided that some objective testing should be done, ...


2

If the battery is that low, then some alternators, even if they are working correctly, will not start to charge properly or at all. Replace the battery with a known good one, then test the charging system thoroughly. That is the only way to check if the alternator is good. You could take the alternator off the vehicle and have it tested on a test bed but ...


1

Can you recharge jump starter by connecting to battery You can, even at idle the alternator will raise the vehicle system voltage, causing the battery to charge, and the jump starter connected to it. while driving However - never move the vehicle with those big clamps on the battery terminals. It's an unfused circuit with not very mechanically positive ...


1

The alternator itself will produce much higher than the car's operating voltage - vehicles have a voltage regulator which cuts the high voltage down to somewhere between 14 and 15v, typically. The "raw" voltage of the alternator is typically around 17 or 18v. Sometimes, the regulator is external, and it's possible to tap the higher voltage directly. On other ...


1

It's common to think of equipment failures as a linear equation where failure rate increases over time. This is not aligned with reality, however. A common way to model failure rates is the use of the 'bathtub curve' My personal experience with batter failures has been with 2 Hondas. One went more than 6 years (72 months) and the other lasted over 12 (...


1

The short answer is no. Revving the engine in neutral (if the car will allow you to do so) will cause no damage. Most Hybrids I have driven will only start the engine if you fully depress the accelerator in neutral. Even when you do this, the engine is only ticking over and wont rev higher unless it is under load.


1

No magical devices to bring a battery back to life.... except water if the level in low. Based on my experiences with dealers, a crooked service tech told her a good battery needed to be replaced. During the visits later on, you got an honest tech.


Only top voted, non community-wiki answers of a minimum length are eligible