I purchased a Noco GBX 75 booster to crank my 2022 F150 if and when it goes to sleep and doesn't wake up..It advertised to boost alll batteries including AGM batteries..Owners manual says do not use on any batteries except lead acid. The manual also says not to ground to truck but to use negative battey post. Which is right?

 

The manual of course. I have a GB70 and it is/has been incredible. Follow your manual. Read about the unit. You will find out why it is "going to sleep".

 

AGM battery is a lead acid battery so you are fine.

 

Did not know that..Thanks...
I've read that gounding to negative post when boosting can damage Battery management system....Any thoughts?

 

Don't know that I believe it would damage it. The owner's manual on my 2015 gives instructions on where to hook up the ground when charging the battery, so that the BMS will see the change in state of charge. I always just connect at the battery and have never had an issue. Same with a jump start.

My opinion is if you want to do it at the battery, hook the cables up to the battery first, then turn the jump box on. This will keep from generating any sparks. I always do that before I plug my battery maintainer in and turn it on.

 

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Your battery booster use is not a charging unit used just for jumping, but a temporary sub for the original Battery power when you need to use it.
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Using a "Battery Charger" to recover a discharge or boost charge a battery over time should be from + to chassis to include the BMS system so it can do a re-calibration over time.
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See Ford PDF 414-00 and section on Battery charging.
There is a difference between jumping and charging.
Good luck.

 

So are you saying to use negative post when boosting and chassis when charging?

 

yes, that is a difference.
BMS can't >use< that large current input during jumping that short time, for any good reason. For example, what would the BMS do with detecting 50 to 100 amps input for 10 seconds? The battery can't recover until the Cell chemistry completes its reverse. That takes time.
After jumping, the BMS takes over control all other times within its system normal control. Takes over running Alternator control to keep charging the Battery up to normal state of charge level, over time required to do this.

 

So it seems like you are saying ground to the chassis when boosting and ground to the battery when charging??????

 

Oh boy!!!!!
1. When >>charging<< with an AGM equipped charger, the BMS should be in the line to monitor the Charge process...........Over the charge time interval.
That can only be done with a connection from Plus + to Chassis Ground because it includes the BMS Sensor located on the Neg Battery terminal.
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2. For Jump Starting it makes little difference if the Jump Battery is on the Neg Battery post or a Chassis point for that short interval at such a high current.
Further, at time of Jump Battery connection, current flows to the vehicle Battery because there is a difference of voltage between the two Batteries that is a normal reaction.
At cranking time, most of the energy is taken from the Jump Battery since the vehicle Battery has little capacity to offer, at that time.
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I might add that Jump Battery instructions don't address ALL the different vehicles and their charging systems. Consider this please.
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Above are two different actions and operations.
Good luck.