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Vehicles & Servicing Car Battery

Discussion in 'Businesses - Services - Products' started by God Bless Texas, Oct 16, 2021.

  1. Senjenbing

    Senjenbing DI Member Veteran Marines Navy

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    Most dealerships offer a recovery service but I believe they just sub-con it, so it works out extremely expensive.

    Good result for the Cowboys - we'll see how the Seahawks fare - playing now (HT)
     
  2. MikeP64

    MikeP64 DI Member Veteran Marines

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    62 miles should be plenty enough to replenish a fully charged battery after one start-up. Corroded connections increases circuit resistance. Increased resistance can slow the rate of charge when running and increase current consumption during start up, both due to the voltage drop resistance causes. With that said and all causes of voltage drop repaired, a good battery that is depleted to the point of not cranking would need more than 30 minutes of idling and a 62 mile drive to bring it to a full charge. This is even more true with modern autos that are supporting multiple electrical consumers like high powered radios, phone chargers and amplifiers, GPS, heated seats and steering wheels, not to mentions common accessories like A/C, wipers, power windows, collision mitigation systems. The list goes on and on. The battery might not have received enough amp hours to sustain the key off consumers until the next day. Key off consumers? All the ECUs should go to sleep after a short period of inactivity, but they don't always do what they are supposed to. If there is an underlying key off current draw, say more than 60ma, you could see a new battery exhibiting the same symptoms after a few weeks or more than 20ma, in a few months. After one 62 mile trip it only returns to 98% SOC, State Of Charge. After the next trip 96% SOC. After the third 94% SOC. Then one day - click.

    Then again, your battery could just be bad.
     
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  3. SkipJack

    SkipJack DI Senior Member

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    These items are driven by the alternator while the engine is running, not the battery. The alternator creates a surplus of energy (watts) at a high potential (14.4 + volts) this surplus energy overflows the consumption (lights, etc.) and fills the battery. These items do not drain the battery.
    There is an issue with "key off" current drain although it is different than you describe. Key off current drain increases the number of discharge cycles the battery experiences. A battery can only be discharged a limited number of times. This depends on the depth of discharge DOD. The deeper the DOD the lower the number of times it can be discharged.

    It this case if the driver is driving 62 miles everyday, the battery is getting up to 100% SOC but the capacity of the battery is decreasing a little with every discharge/charge cycle.
    The OP stated that they had a 3 year life from the battery. This is within the 3 - 5 year design life of a low cost battery.
    https://www.power-sonic.com/blog/features-of-sealed-lead-acid-batteries/
     
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  4. MikeP64

    MikeP64 DI Member Veteran Marines

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    Correct, bad choice of wording on my part. I should have wrote the battery could have reached the end of it's life cycle, instead.
     
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