I agree that 50% is not practical for general UPS usage, unless the usage scenario are short outages or just brownouts.
My EB3A arrived charged at exactly 60%. Maybe that’s slightly better for a LiFePO4 than keeping it at 80%. Yet 80% is way better for the battery lifetime than keeping it at 100% which it charges to by default. That’s why a user-definable charge-limit would be great - everyone could just perfectly adapt the battery life vs. available charge to their current usage scenarios.
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I was considering a EB3A as a UPS, but the lack of this charge limit discourages me significantly.
I’m looking for just minutes to tens of minutes of runtime and I’ll take longevity over 5 minutes of extra capacity. This seems like a fairly straightforward feature to introduce and your competition has it.
Thank you.
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Which models are that?
+1 for this 80% charge limit feature request. This is especially must have for UPS mode.
Please forward this feature request to engineering team.
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Another vote for a configurable charge limit if it also helps to extend the Life of LifePo4 battery.
Another +1 for this 80% charge limit.
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One more vote for this funtionality.
+1 must have feature!
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I buy two EB3As and still don’t have this feature?! how so?!!! +2 vote for this funtionality.
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+1 must have for me very important
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I saw that the last comment was more than a year ago, but as a new customer, I am really surprised, that there is no option for limited charging (would be great for UPS usage). Please make it happen 
I’d get able to get a lot more use out of my AC180 if it had a max battery charge limit setting in the app. 80% would be great. Is this a possibility?
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+1
Bluetti, be better and give this options to people.
+1
Surprised this function doesn’t exist already.
@BLUETTI I’ve just bought EP500pro, this is my first BLUETTI product and I’m very disappointed that it doesn’t have a feature to stop charging after achieving a set % of capacity (for example 80%).
Please add this feature.
Same here, for my AC180P. Loving the device, but currently don’t want to use it as UPS as I don’t want to keep it charged to 100%. Please introduce this feature!
+1 vote for this feature. I have my generator in a remote location I vist once a month or less. Keeping it at 80 while not there and using 100% when I am should extend battery life
I recently bought my new AC200P L and was disappointed to find that there’s no charge limiting feature. Even my two-year-old EcoFlow had this capability. I don’t think constantly charging to 100% is going to be good for the battery, right?
I’m going to put out another point of view on this topic.
The first thought is that the BMS never allows the batteries to actually get to 0% charge, or to 100% charge. I believe there is around a 5% to 10% capacity on each end of the spectrum that is “untouchable” to the device use. Meaning that 0% or 100% represents the usable capacity of the battery as constrained by the BMS in the device.
The chemistry of LiFePO batteries is quite different from “standard” lithium batteries, and they handle cycling of charge storage much better, and do not have any memory effect.
The Bluetti power stations, while having a range of cycle capacities, are normally capable of being cycled 3,500 times from 0% to 100%, per the displayed state of charge. That is pretty much a full charge from 0% to 100% every day for 10 years. And after those 10 years you will still have 80% of the capacity of the battery available to you, to keep cycling with.
The longevity of this battery type is so vastly superior that it no longer makes sense to try managing them in the same way as the older technology. By the time 10 years is done there will be vastly superior devices around, and it will be time to upgrade (or just keep using them for another 10 years).
Just use them, they can handle it.
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Oh, it’d be fantastic if the BMS did that on all battery-powered appliances. My smaller devices like earbuds typically lose 60%+ or their capacity over the years, as it’s difficult to manually manage the charge levels there - sure, they use a LiPo and no LiFePO4, but still.
From what I remember there were a whole bunch of standard tests for different powerstations: Getting their exact capacity from the hardware, measuring input Wh for a full 0 to 100 charge and for a full 100 to 0 discharge (AC/DC). The EB3A got a “normal” (efficiency) score there, indicating that the full capacity was used without a reserve on either side of the charge.
LiFePO4 batteries are more robust than LiPos for sure, and it’s true that a lot of people treat their devices as a basic commodity that they’ll replace in a few years anyway. There the battery wear doesn’t really matter.
I prefer avoiding battery wear when not necessary and keep devices in good condition for longer usage periods. When I need the full capacity then I do the full 100% to 0% cycle, that’s what I have it for. When I don’t need to full capacity - either for UPS usage or storing it for a bit - I prefer a state of charge that minimizes wear on the battery.
I think I even read on some Bluetti documentation that storing the powerstation at 100% leads to quite a bit of battery drain that reduces the capacity temporarily, which can be mostly reversed with a few full charge/discharge cycles.