Kansan
Well-known member
I installed the DieHard H3-xEV. The labeling indicates 420 CCA and 40 amp hour capacity. The OEM battery label indicates 380 CCA and 35 amp hour capacity.
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I'm eyeballing this as my replacement, going to swap it out when the truck hits 3 years old in August.
GoodSam
Well-known member
Can you set a departure time for every day that would bump the charging? It would waste some energy heating the HV battery pack - not sure if that would pay off. How deep are those 12Vdc battery discharges? I also thought that the updated Battery Monitoring Sensor was doing a better job of keeping the LV battery topped off, even if truck sits? Is an OBD2 bluetooth monitor draining the LV?
Remember that departure timer will only kick on two times, then require a manual start on the third day to reset the departure/remote start counter.
Adventureboy
Well-known member
Yes departure time might work but it seems silly to jump hoops like that. The LVB discharges are down to about 40% SOC before the truck shuts things down and charges it. I have the updated sensor but I think that only fixes a calibration issue. No OBD2 monitoring.
Now I simply plug in my 5 amp battery maintainer when I know I won’t drive for a couple of days. I really think it is just the number of deep cycles that kill the LVB. I have 2-3 discharges per week down to 50-60% which the LVB isn’t happy with.
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GoodSam
Well-known member
My understanding is that the lead acid battery longest life is attained by keeping it fully charged. Shame if Ford is not doing that when there is a nice big HV battery to draw from.
Adventureboy
Well-known member
True for flooded lead-acid batteries. For AGM batteries, slightly less than fully charged is better as it reduces the risk of burning the plates. AGM is happy around 80-90% SOC long term. Our trucks do this but only when running or when charging the HVB. It does not manage the discharge until it senses an "emergency" situation at 40% which is simply too low. Below 50% for any length of time is quite hard on them, especially repeated discharges or longer times spent below 60-70%. A maintenance profile that kicks in around 70% and charges to 100% and maintains to say 90% would work well. Do that 10 times before shutting the truck down, and all would be well.
johnnyonetime
Well-known member
I eliminated my LVB issues 2 years ago with the Ohmmu H3+. 19 lbs lighter and worry free. 54k miles and counting.
Kansan
Well-known member
On my extended vacation in January I found that departure times didn’t have that limit. The truck sat for 18 days plugged in and it probably woke up for at least a half dozen departure events.
I also found that the charge from a 20 minute warming session resulted in a net loss in LVB charge. The modules stay awake for a half hour after the event and consume more charge than the system adds. Maybe a 30 minute session would result in a small increase in LVB SOC. It’s also possible that the charge rate in warmer weather might be higher resulting in a better net charge
I think it’s just climate starts that have the limit.
Interesting, I've experienced the opposite, maybe there has been a modification of the logic since initial production, I haven't tried exceeding the assumed limitations since experiencing them in 2022.
Maybe your 2024 and others have yet another undocumented feature?
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We've experimented with having the HVAC blower motor set at manual medium/high causes a higher output rate from the DC/DC inverter, this was the case when leaving the truck running from Push to Start and letting the 30 minute timer run to expiration. These tests were done prior to the release of the improved LVB BMS, again MY22/MY23 trucks, while MY24+ have better everything, possibly improved base logic from the factory.
Lytning
Well-known member
The Ohmmu website currently shows 2 batteries for the Lightning ... a Sodium battery and a Lithium battery. I assume you are using the Lithium battery. I read where the Ohmmu app displays 12 volt SOC. Out of curiosity, what SOC do you usually find the battery is at?
johnnyonetime
Well-known member
Yes I have the lithium battery and SOC is typically around 90%. Wife just got home from a short trip and this a screenshot from the app.
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