- First Name
- Brian
- Joined
- Sep 14, 2023
- Threads
- 60
- Messages
- 8,227
- Reaction score
- 14,564
- Location
- Central CA
- Vehicle(s)
- '23 BB 4dr 7MT, '22 BSport OBX, '87 B-II XL
- Your Bronco Model
- Big Bend
It's possible.Hmm, maybe the battery is junk. Will drive it some and see what happens.
That said, all these AGM batteries are a bit finicky, and it doesn't help that the Bronco has the dynamic BMS charging system, so it doesn't always charge at a steady rate either. The BMS could be holding back from charging due to low/high temps or other reasons that aren't entirely clear.
I'm all for going out and driving your Bronco, and hopefully that works for you. But really the best thing for the battery is to get a $40 AGM-capable trickle charger / maintainer, since the BMS doesn't always do what you want it to do. And there's a boat load of stuff the Bronco does even when your vehicle is not running - like running cooling fans for the headlights, and all those clicks and whizzes the engine does after it's shut down, the computer that runs security listening for your keyfob and FordPass commands, and running the computer and modem to be able to download and install those updates.
It's programmed that way to try and give the battery a long life while still being able to do all these things that are considered modern conveniences. And I guess for the most part it does, but it doesn't always do what ~you~ want it to do, and it doesn't tell you what it's doing or why it's doing it.
All the computers and electric-driven things on these Broncos (well, almost all modern cars really) just place a lot more load on a battery than they have ever had before, and it needs way cleaner power than just the old starter motor and halogen headlights and a cigarette lighter required.
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