Proper jump starting

[Severum17]

Are the portable jump boxes safe to use on the Bronco? What is the proper connections? Positive and negative terminals, or use the ground on the fender? What is the sensor on top of the negative terminal? Is that the BMS? I just dont want to fry something.

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[PWillette]

Are the portable jump boxes safe to use on the Bronco? What is the proper connections? Positive and negative terminals, or use the ground on the fender? What is the sensor on top of the negative terminal? Is that the BMS? I just dont want to fry something.

Yes, they are safe. Positive directly to the battery post...negative outside the BMS (do not connect directly to battery negative post)

EDIT: Yes, the sensor on the negative post is the BMS. You can connect to the tab on the BMS or other suitable ground.

 

[gbub]

I know it is best to attach to the negative side outside the BMS for charging but why would that be important for jump starting?

 

[PWillette]

I know it is best to attach to the negative side outside the BMS for charging but why would that be important for jump starting?

AFAIK it can still affect the BMS.

 

[Ducati1098]

Jump starting doesn't make a difference. You can just go right on the posts.
BMS only makes a difference for charging

 

[PWillette]

I stand corrected...carry on

 

[Ducati1098]

I stand corrected...carry on

You are still correct. It could still affect BMS, just not in any meaningful way if the battery is already depleted enough to need a jump start.
Normally if the battery is so low that it needs a jump, most people will either charge it right jumping it to move it somewhere, or have it replaced.

 

[Nibroc99]

Are the portable jump boxes safe to use on the Bronco? What is the proper connections? Positive and negative terminals, or use the ground on the fender? What is the sensor on top of the negative terminal? Is that the BMS? I just dont want to fry something.

I've never had an issue the five or so times that I've jumped uszing my Cobra jumppack straight on the battery terminals.

Jump starting doesn't make a difference. You can just go right on the posts.
BMS only makes a difference for charging

I have my battery maintainer hooked straight to the terminals. Are you sure it causes issues? Haven';t had any issues charging it every night for 2 months, my voltage while driving drops from 14.9 to 13.2-ish fairly quick after a night of charging. If I'm driving long enough, I've even seen it drop to 12.8V consistently for a few hours until I turn the vehicle off and back on again (during road trips). What am I potentially damaging by not charging through the BMS? Will definitely reconfigure my charger's connections if it's worth doing. I'm using a 4amp waterproof Everstart battery maintainer.

 

[Ducati1098]

I have my battery maintainer hooked straight to the terminals. Are you sure it causes issues? Haven';t had any issues charging it every night for 2 months, my voltage while driving drops from 14.9 to 13.2-ish fairly quick after a night of charging. If I'm driving long enough, I've even seen it drop to 12.8V consistently for a few hours until I turn the vehicle off and back on again (during road trips). What am I potentially damaging by not charging through the BMS? Will definitely reconfigure my charger's connections if it's worth doing. I'm using a 4amp waterproof Everstart battery maintainer.

You aren't necessarily damaging anything, you're just completely bypassing the BMS system. The BMS is what determines the batteries condition and state of charge.
The battery might be 100% charged, but the vehicle wont think it is. So then anytime the vehicle is driven, it isn't charging it correctly which can lead to a failed battery much sooner.

 

[Nibroc99]

You aren't necessarily damaging anything, you're just completely bypassing the BMS system. The BMS is what determines the batteries condition and state of charge.
The battery might be 100% charged, but the vehicle wont think it is. So then anytime the vehicle is driven, it isn't charging it correctly which can lead to a failed battery much sooner.

Gotcha. By the voltage readouts I'm seeing, I feel like the BMS is indeed seeing a fully charged battery. But I'll still see if I can hook it up post-bms when I get out of work today, though. Maybe I actually do have it hooked up right and just didn't realize it haha. Thanks!

 

[Severum17]

Yes, they are safe. Positive directly to the battery post...negative outside the BMS (do not connect directly to battery negative post)

EDIT: Yes, the sensor on the negative post is the BMS. You can connect to the tab on the BMS or other suitable ground.

When you say outside the BMS would that be the ground on the fender, or the tab off the BMS?

 

[Ducati1098]

Gotcha. By the voltage readouts I'm seeing, I feel like the BMS is indeed seeing a fully charged battery. But I'll still see if I can hook it up post-bms when I get out of work today, though. Maybe I actually do have it hooked up right and just didn't realize it haha. Thanks!

The voltage readouts are far more complicated than you would expect. There is a lot going on and constant changes depending on multiple things. So I wouldn't necessarily base anything off of those readings.

The main issue is just that there will be a huge difference in actual battery SOC and what the BMS shows as far as SOC when you bypass the BMS. This can cause all sorts of issues over time.

When you say outside the BMS would that be the ground on the fender, or the tab off the BMS?

Any good chassis ground is fine, or the little tab coming off the BMS sensor works fine also. Basically anything except the battery post or terminal clamp.

 

[GoHawks63]

I've never had an issue the five or so times that I've jumped uszing my Cobra jumppack straight on the battery terminals.


I have my battery maintainer hooked straight to the terminals. Are you sure it causes issues? Haven';t had any issues charging it every night for 2 months, my voltage while driving drops from 14.9 to 13.2-ish fairly quick after a night of charging. If I'm driving long enough, I've even seen it drop to 12.8V consistently for a few hours until I turn the vehicle off and back on again (during road trips). What am I potentially damaging by not charging through the BMS? Will definitely reconfigure my charger's connections if it's worth doing. I'm using a 4amp waterproof Everstart battery maintainer.

The BMS monitors the battery's state of charge and makes adjustments to the rate of charging. Apparently, by hooking up your battery tender to the posts causes the BMS and battery to be out of sync and may shorten battery life.

On a similar note, the charging system in my previous BMW would monitor the age of the battery and as it aged it would make adjustments at the rate it would recharge. When replacing the battery, you had to "register" the new battery. Basically, telling the car's computer that a new battery was installed so that it didn't treat the new battery the same as the old one.

Not registering the new battery risked shortening the life of the new battery.


EDIT: @Ducati1018 did a better job than my explaining it.

Does anyone know if the same procedure is required with the Bronco?

 

[Nibroc99]

I think I actually do have mine hooked up after the BMS then! Didn't realize the BMS was actually part of this stud. Black wire I'm touching goes to the battery tender. (The brown/orange goop is NOCO battery terminal anti-corrosion spray-on goop)

 

[Ducati1098]

The BMS monitors the battery's state of charge and makes adjustments to the rate of charging. Apparently, by hooking up your battery tender to the posts causes the BMS and battery to be out of sync and may shorten battery life.

On a similar note, the charging system in my previous BMW would monitor the age of the battery and as it aged it would make adjustments at the rate it would recharge. When replacing the battery, you had to "register" the new battery. Basically, telling the car's computer that a new battery was installed so that it didn't treat the new battery the same as the old one.

Not registering the new battery risked shortening the life of the new battery.


EDIT: @Ducati1018 did a better job than my explaining it.

Does anyone know if the same procedure is required with the Bronco?

Yes there is a BMS reset that needs to be done anytime the battery is replaced for Fords also

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