Deep sleep after being on charger for six days

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I believe the batteries are not the total reason for all these low battery voltage issues. The logic of how much charge the battery is given, is determined by the PCM. The PCM assesses various inputs to decide the charge rate. There in lies the issue! The battery has a 45AH rating. From what I‘ve read, a charge of 10-30% of that value should be used. So, between 4.5 & 13.5 amps, depending on SOC……I recently added a BT enabled voltage monitor(attached to battery posts). Over the past 3 days I’ve noticed a split second dip in voltage every hour! Over the past 9 hrs, the voltage has gone from 12.50v to 12.23v.
Current draw on monitor is stated as 1.5ma., which should be an insignificant amount. I really don’t have any way of checking this, what with the vehicle waking up at slightest touch, and such low current….
There are way to many threads on this battery issue…., makes it tough to keep up on all the info. Bill P

I agree. The battery should be more than capable of maintaining a charge level for six days without a charger attached let alone with one attached when parked in a garage that never got below 50°.

This is an internal software thing that turns on systems of the vehicle (even if telemetry is off) and this uses the 12v battery.

Clearly there is more power demand being called for while the vehicle sits. This goes deeper than the Maverick, the Escape hybrid has the same issue:

We have a new 2023 Ford Escape Hybrid that now has 4k miles and we started getting the deep sleep issue just this week. My wife drives the vehicle around 70 miles per day to work and back 5 days per week and then it will normally sit on Saturday and Sunday. We have a call into the dealer to see what they want to do. After reading up on the issue they'll probably just replace the 12V battery and the issue will most likely come back sooner rather than later.

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I'd imagine upgrading to a larger reserve battery won't actually help, it will just hide the problem. Power will still be drawing from that battery and it will affect it's longevity. In addition, we have no idea if the charging system is even capable of understanding the larger battery and how it's logic is designed.

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[22XLThybrid]

Had this happen after it was topped off with a maintainer over night. Drove it 4. MI shut it off, battery saver mode. It was just an interesting observation I thought. A Faraday box really did help for most of my issues. I just stuck it on the maintainer because it was sitting in the garage for 5 days during some snow and I used an old Fiesta with a stick and dedicated snow tires. I've never had the Maverick not start though and just keep a jump battery on hand in case. Original battery on a 4/22 delivery. I figure I'm going to have them run the tests on it before my bumper to bumper is out in April and I need an oil change next time.

 

[HeyBales]

I believe if interior lights are disabled, it's in deep sleep mode.

Which is so odd, it was hooked up to a fully capable charger for six days.

No actually - deep sleep mode only disables the TCU. That was in one of the SSM memos.

Battery saver is everything else, and it can vary the amount of change it effects from sooner & sooner to off immediately.

It seems a drive or the 8-hr relearn is required to get out of a mode - just having a higher Voltage on battery won't do it.

 

[inline_five]

No actually - deep sleep mode only disables the TCU. That was in one of the SSM memos.

Battery saver is everything else, and it can vary the amount of change it effects from sooner & sooner to off immediately.

It seems a drive or the 8-hr relearn is required to get out of a mode - just having a higher Voltage on battery won't do it.

Interesting. I posted in your other thread as well.

 

[MakinDoForNow]

I agree. The battery should be more than capable of maintaining a charge level for six days without a charger attached let alone with one attached when parked in a garage that never got below 50°.

This is an internal software thing that turns on systems of the vehicle (even if telemetry is off) and this uses the 12v battery.

Clearly there is more power demand being called for while the vehicle sits. This goes deeper than the Maverick, the Escape hybrid has the same issue:



I'd imagine upgrading to a larger reserve battery won't actually help, it will just hide the problem. Power will still be drawing from that battery and it will affect it's longevity. In addition, we have no idea if the charging system is even capable of understanding the larger battery and how it's logic is designed.

When I put my g5 maintainer on my hybrid mave jump posts I double lock my truck and each and every day I will unlock the door maybe without even opening the door. This unlock and relock will restart the maintainer and within a few minutes will restart the optimization routine which on a battery that has been optimized yesterday should finish within minutes. The locking of the truck should start the "up to 8 hour battery learn routine" each day which most likely will have at least 2 hours timer to allow the battery to settle. That will be the fully charged voltage target for the installed battery. (If you have a battery with 12.2 volts when battery learn is ran it MAY BE the target voltage until the truck learns a higher voltage. I don't know for sure but it appears a strong possibility). In any case rerunning "battery learn" for 4 or more days will allow multiple "nails to be driven into a completed coffin" (pun on deep sleep). The battery even with a random or periodic draw will be repeatedly seen fully charged by the truck (maybe 99.8%,99.92%,99.94%,etc....) and also get to primarily rest really close to it's full capacity. At 2 years old it may be close to 100% charged and have 5% or less amp hour capacity.

 

[Mark1]

What about some form of a deep cycle battery. The hybrid doesn't use the 12 volt battery to start. Not requiring a short burst of power like a gas motor. More of a drain and trickle recharge cycle.
1 hour, each time after turning off the vehicle it starts cycling through tests. One being the EGR system and pressurizing it to check the fuel tank and lines for leaks. It's constantly drawing small amounts of power while sitting. No normal battery can survive that. The life is shortened or killed.

 

[inline_five]

No actually - deep sleep mode only disables the TCU. That was in one of the SSM memos.

Battery saver is everything else, and it can vary the amount of change it effects from sooner & sooner to off immediately.

It seems a drive or the 8-hr relearn is required to get out of a mode - just having a higher Voltage on battery won't do it.

Just a follow up, @HeyBales you were correct. I drove it for about 2 mins around the block, took off the charger and turned on telemetry. It sat for 2+ days and remained accessible the entire time. So, seems battery is still good (for now). I'm getting one of those monitors so I can try different settings/things and see how that effects voltage over time.

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