Sponsored

Battery reserve capacity and OTA's

Big Dog Daddy

Well-known member
First Name
Mark
Joined
May 27, 2021
Threads
26
Messages
1,777
Reaction score
2,642
Location
New Jersey
Vehicles
2021 F150 Lariat 5.0 4x4 Ex Cab Antimatter Blue
The 760 battery on my 21 Lariat 500a was replaced after 1 year in service. The dealer replaced it with the same. Living in the northeast with cold winters I've been considering upgrading my battery for the additional CCA's as well as higher reserve capacity when larger OTA's are being installed. It's my understanding that Reserve Capacity is rated in minutes.

After researching this with my dealer's parts department here's what I found out.

The battery tray for all 2021 F-150's is the same part number. ML3Z-10732-D (including the diesel) and it is 14" x 7" where the battery rests. The hold down is the same for all as well. The battery's that were installed are listed below.

Part numberTypeGroupCCACAReserve CapacityLengthWidthHeightUsage
BAGM-48H6-760AGM48/H676095012010.946.897.48up to Lariat low
BAGM-94RH7-800AGM94R/H7800100014012.46.897.48Lariat high and above
BAGM-49H8-850AGM49/H8850106216013.946.897.48Diesel

I'm not sure if the cables on my 5.0 will reach the additional 2" if I were to upgrade to the 850 I'm still trying to figure this out. The 800 will defiantly work as I've seen on other trucks here on the forum.

Has anyone tried to install the BAGM-49H8-850 in there non diesel truck?
Are there any changes to would need to be made in BCM for BMS when changing battery size?

Additionally, Here the part numbers for battery heat shields / insulators for battery size listed above.

Cover Assembly - Battery - Ford (KL3Z-10A687-A)760 amp. 2021
Cover Assembly - Battery - Ford (KL3Z-10A687-B)800 amp. 2021
Cover Assembly - Battery - Ford (KL3Z-10A687-C)850 amp. 2021
Sponsored

 

JEB

Well-known member
Joined
Aug 15, 2021
Threads
1
Messages
1,731
Reaction score
1,721
Location
Northern Illinois
Vehicles
2021 F150 Lariat PB 502a
The 760 battery on my 21 Lariat 500a was replaced after 1 year in service. The dealer replaced it with the same. Living in the northeast with cold winters I've been considering upgrading my battery for the additional CCA's as well as higher reserve capacity when larger OTA's are being installed. It's my understanding that Reserve Capacity is rated in minutes.

After researching this with my dealer's parts department here's what I found out.

The battery tray for all 2021 F-150's is the same part number. ML3Z-10732-D (including the diesel) and it is 14" x 7" where the battery rests. The hold down is the same for all as well. The battery's that were installed are listed below.

Part numberTypeGroupCCACAReserve CapacityLengthWidthHeightUsage
BAGM-48H6-760AGM48/H676095012010.946.897.48up to Lariat low
BAGM-94RH7-800AGM94R/H7800100014012.46.897.48Lariat high and above
BAGM-49H8-850AGM49/H8850106216013.946.897.48Diesel

I'm not sure if the cables on my 5.0 will reach the additional 2" if I were to upgrade to the 850 I'm still trying to figure this out. The 800 will defiantly work as I've seen on other trucks here on the forum.

Has anyone tried to install the BAGM-49H8-850 in there non diesel truck?
Are there any changes to would need to be made in BCM for BMS when changing battery size?

Additionally, Here the part numbers for battery heat shields / insulators for battery size listed above.

Cover Assembly - Battery - Ford (KL3Z-10A687-A)760 amp. 2021
Cover Assembly - Battery - Ford (KL3Z-10A687-B)800 amp. 2021
Cover Assembly - Battery - Ford (KL3Z-10A687-C)850 amp. 2021
The H8-AGM is standard in the Powerboost. It fits fine. If you search for batteries in the H8 group size, you will find plenty of options. Focus on amp hours rather than reserve capacity. It’s a better measure of the battery’s ability to handle the 12V loads over time. But in the H8 group size and AGM construction, the amp hours of just about any battery you find will be pretty close.
 

ColoradoHunter

Well-known member
First Name
Dennis
Joined
May 10, 2021
Threads
10
Messages
325
Reaction score
298
Location
Colorado
Vehicles
2021 F150 King Ranch 4x4
Occupation
Retired

JEB

Well-known member
Joined
Aug 15, 2021
Threads
1
Messages
1,731
Reaction score
1,721
Location
Northern Illinois
Vehicles
2021 F150 Lariat PB 502a
According to the 2021 specs it is a H7 battery in the powerboost. The H8 is longer and will not fit. Even the link you provided says the H8 will not fit the powerboost.
Aw crap. You’re right. I just checked. It is an H7. Sorry. Better get back on my Alzheimer’s medication.
 
Last edited:

Sponsored

ColoradoHunter

Well-known member
First Name
Dennis
Joined
May 10, 2021
Threads
10
Messages
325
Reaction score
298
Location
Colorado
Vehicles
2021 F150 King Ranch 4x4
Occupation
Retired
Aw crap. You’re right. I just checked. It is an H7. Sorry. Better get back on my Azheimer’s medication.
LOL No problem, I get that same problem. Getting older sucks!
 
OP
OP
Big Dog Daddy

Big Dog Daddy

Well-known member
First Name
Mark
Joined
May 27, 2021
Threads
26
Messages
1,777
Reaction score
2,642
Location
New Jersey
Vehicles
2021 F150 Lariat 5.0 4x4 Ex Cab Antimatter Blue
Guys, I'm not sure why, but the parts guy at Ford said the H8 was supplied on the 2021 diesel trucks. And that the battery tray was the same p/n. I would really like to stuff that H8 under my hood if possible.
Can someone with a 2021 diesel post a picture of there battery?
 

JEB

Well-known member
Joined
Aug 15, 2021
Threads
1
Messages
1,731
Reaction score
1,721
Location
Northern Illinois
Vehicles
2021 F150 Lariat PB 502a
Guys, I'm not sure why, but the parts guy at Ford said the H8 was supplied on the 2021 diesel trucks. And that the battery tray was the same p/n. I would really like to stuff that H8 under my hood if possible.
Can someone with a 2021 diesel post a picture of there battery?
I took a close look at the battery tray on my truck—not a diesel but I got a good look at the tray. The problem with getting an H8 on it is that there are modules installed along the left side of the tray in the space between the tray’s edge and the side of the battery. The width and height of the H7 and H8 are the same but there’s a 39mm difference in the width. If the modules weren’t there, the H8 would fit fine on the tray. But the modules take up about 2/3 of that free tray space on mine and would prevent installation of the bigger battery unless the modules could be relocated.

You have a 5.0. Look on the left side of the battery tray. If you also have modules on the left hand side, you probably have the same problem.
 
OP
OP
Big Dog Daddy

Big Dog Daddy

Well-known member
First Name
Mark
Joined
May 27, 2021
Threads
26
Messages
1,777
Reaction score
2,642
Location
New Jersey
Vehicles
2021 F150 Lariat 5.0 4x4 Ex Cab Antimatter Blue
I took a close look at the battery tray on my truck—not a diesel but I got a good look at the tray. The problem with getting an H8 on it is that there are modules installed along the left side of the tray in the space between the tray’s edge and the side of the battery. The width and height of the H7 and H8 are the same but there’s a 39mm difference in the width. If the modules weren’t there, the H8 would fit fine on the tray. But the modules take up about 2/3 of that free tray space on mine and would prevent installation of the bigger battery unless the modules could be relocated.

You have a 5.0. Look on the left side of the battery tray. If you also have modules on the left hand side, you probably have the same problem.
Thanks!
So I took a look under the hood of my truck this afternoon. I must have gotten the most stripped down Lariat they ever made! Lol, no modules in the battery box, the smallest battery they could supply, and not even the small battery under the back seat!
The good news is that I have an additional 3 inches on one side , plus an additional 3/4" on the other side. So I definitely have room to put the H8 under my hood. Although I may have to separate the wrapping on the positive harness slightly to spread the cables far enough.

Ford F-150 Battery reserve capacity and OTA's 20220708_130634
 

Sponsored


JEB

Well-known member
Joined
Aug 15, 2021
Threads
1
Messages
1,731
Reaction score
1,721
Location
Northern Illinois
Vehicles
2021 F150 Lariat PB 502a
Thanks!
So I took a look under the hood of my truck this afternoon. I must have gotten the most stripped down Lariat they ever made! Lol, no modules in the battery box, the smallest battery they could supply, and not even the small battery under the back seat!
The good news is that I have an additional 3 inches on one side , plus an additional 3/4" on the other side. So I definitely have room to put the H8 under my hood. Although I may have to separate the wrapping on the positive harness slightly to spread the cables far enough.

20220708_130634.jpg
Outstanding! That empty slot under your tape is for a bracket holding a couple of modules in my tray. You, my friend, appear to be in business, with room to spare. You might need a bigger battery wrap but tray space shouldn’t be a problem. An H8 will buy you about 15 extra amp hours and at least 50 additional CCA—probably more. Very cool.
 
OP
OP
Big Dog Daddy

Big Dog Daddy

Well-known member
First Name
Mark
Joined
May 27, 2021
Threads
26
Messages
1,777
Reaction score
2,642
Location
New Jersey
Vehicles
2021 F150 Lariat 5.0 4x4 Ex Cab Antimatter Blue
Outstanding! That empty slot under your tape is for a bracket holding a couple of modules in my tray. You, my friend, appear to be in business, with room to spare. You might need a bigger battery wrap but tray space shouldn’t be a problem. An H8 will buy you about 15 extra amp hours and at least 50 additional CCA—probably more. Very cool.
Yes! Sir
I'm very excited about this. I really think they left my truck a little castrated, as far as 12v power goes, and it may also explain why larger OTA's fail to install without a battery maintainer being attached.
 

Blackout150

Well-known member
First Name
Stephen
Joined
May 29, 2022
Threads
12
Messages
1,705
Reaction score
1,960
Location
Elk Grove ca
Vehicles
2013 F150 2022 F150
Yes! Sir
I'm very excited about this. I really think they left my truck a little castrated, as far as 12v power goes, and it may also explain why larger OTA's fail to install without a battery maintainer being attached.
So you have a powerboost? Is it a 502a?
 
OP
OP
Big Dog Daddy

Big Dog Daddy

Well-known member
First Name
Mark
Joined
May 27, 2021
Threads
26
Messages
1,777
Reaction score
2,642
Location
New Jersey
Vehicles
2021 F150 Lariat 5.0 4x4 Ex Cab Antimatter Blue
So you have a powerboost? Is it a 502a?
No, it's a 500 excab 5.0 w/o 400 watt inverter. So pretty much a base Lariat. I ordered it this why because I really like the40/20/40 bench and it's the highest you can go to still seat 6 if needed.
Plus whats a truck without a bench seat up front! Guess I'm old school ha ha
 

JEB

Well-known member
Joined
Aug 15, 2021
Threads
1
Messages
1,731
Reaction score
1,721
Location
Northern Illinois
Vehicles
2021 F150 Lariat PB 502a
Yes! Sir
I'm very excited about this. I really think they left my truck a little castrated, as far as 12v power goes, and it may also explain why larger OTA's fail to install without a battery maintainer being attached.
Yeah. An underpowered battery certainly didn’t help.

Now the fun begins—battery shopping. You have lots of options, but (and I can’t believe I’m saying this) take a look at the EverStart Platinum at Wal-Mart. 900CCA, 95Ah, 4 year replacement warranty. Made by Johnson Controls. $170. It’s a steal.
Sponsored

 
 




Top