It is the HV battery that starts the engine, not the 12V battery in the '09 FEH. If your HV battery is that low, you need to talk to your dealer and have it tested.

 

Without the HV jump start system, you have two options:

1) Open HV battery up and manually charge it with a high voltage, low current power supply.
2) Take it to the Ford dealership where they can use a special charger to charge the HV battery. Good chance the techs won't know what they're doing.

Good luck,

Steve

 

[QUOTE=wwest;235224]It is my understanding that the HV battery can be recharged, minimally recharged, using a fully charged 12 volt battery as a charging source. My understanding is that there is a DC-DC voltage up-converter (inverter) for doing this. Might take ~24 hours to restore a ~full charge so it would probably be a requirement to have a charger on the 12 volt battery during that entire period.

Obviously there is a possibility that your Dc-DC upconverter has failed.[/QUOTE.


Has anyone come up with a fix a fix or a way to jump start the hybrid battery on a 2011 Escape hybrid?

 

Yes, 1 post up. Linked below for your convenience:

https://www.greenhybrid.com/forums/f...tml#post267798

 

It’s a 2011 without the HV recharge button. The dealer said they would not recharge the battery with they’re special charger that they “ think” it needs a new battery.

 

They should be able to document the specific data leading them to that conclusion. High Delta SoC number, high block deviation number, etc.

IMHO, the issue is likely that they have to order/lease the charger since it's not at every dealer, and they'd rather replace it and make a lot more money.

Ask them to document:

HV Battery Voltage
SoC
Delta SoC
Block deviation

Hell... just have them dump the entire freeze frame data from the BCM and ask them what data are indicating the battery needs to be replaced.

If the vehicle has been sitting for a long time, highly likely it's gone flat and just needs to be charged. If the vehicle has been driven regularly, and this issue is out of the blue, then it may indeed need to be replaced. IMHO, when they removed the rear a/C for cooling the battery, they decided that they wanted to remove the one thing that made their batteries highly reliable.