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Is there a way to safely charge a car battery with this equipment? If not, why?

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floobydust:
Any suggestions for equalize charge voltage on FLA? Trojan gives 2.7Vpc for 16.2V which seems pretty high.
I had 12.7V at rest and levelled off at 14.7V at 0.5A (2.45Vpc) overnight.

One particular car maker has ~135mA parasitic drain due to the ECU. The batteries would barely last 3 years. I think a firmware fix got it down to 70mA. An ECU typically does a fuel-pump run to cool the fuel rail (anti-percolation), a canister-purge after parked for hours, TPMS checks etc. - lots of stuff after key off which drains any surface charge.

Simon:
Well my car tonight according to a cheapo USB charger went as high as 14.5V dropping to 14.3-14.4. However I did leave the dash cam on all weekend and do short journey's so assuming the alternator can be controlled maybe it knows that the battery is low (started at 12.3V). I'll see how it performs over the next week

Yansi:
What car maker does have 100mA drain?  Such ECU would not pass even the basic LV124 tests.  ;D

Yansi:

--- Quote from: Simon on October 21, 2019, 06:28:05 pm ---Well my car tonight according to a cheapo USB charger went as high as 14.5V dropping to 14.3-14.4. However I did leave the dash cam on all weekend and do short journey's so assuming the alternator can be controlled maybe it knows that the battery is low (started at 12.3V). I'll see how it performs over the next week

--- End quote ---

So the car charges at over 14 volts after all?  :-DD 

Simon:
Like i said the battery was low. And like I said this is not universal, my last car was 13.8V and commercial vehicles 27-27.5. Lets see how it goes over the week as the battery charges back up again from the weekend abuse.

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