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Please note that the U27-12XP's (the whole XP series, actually) are not drop-in replacements, but system batteries. The RT series are fully independent drop-in replacements. XP's are intended to be run using an external BMS. There is some smarts in the individual batteries, but very limited...

Thanks, Cliffman. Good info. That sounds pretty consistent with what I am seeing out of my batteries. I wouldn't want to move that low voltage cut-off without monitoring cell group voltages especially during a hot discharge. I could see a current-based cut-off threshold, but I also might be...

The manual for the RT doesn't explicitly say so, which is weird, but I can't see how anyone would make a battery that can't be put in parallel with a sibling. The manual clearly says that you can put up to four of them in series. I would be shocked if you had a problem with a parallel...

I am doing something similar. The difference is that my inverter has a fixed low-voltage cut-off of 10.0 V, which is too low. I am using an external device for a low voltage cut-off. For low-temperature, I intend to not let the batteries get cold while in use.

My thought here, too. So this battery is not super useful to me. Does anyone want to take it for the cells? I am New Orleans: someone can come and get it or I might be willing to ship for the shipping cost. It would be a shame to throw away that much good Li given the current market...

I am new to the group, but in a situation similar to others here. Purchased two U27-12XP's off of Ebay without fully understanding the difference between the XP and the RT series. I will be using them for boondocking in a travel trailer and charging with solar. I also went through the route...

I have had a set of four U27-12XP that I have been using without issues for over two years. They are great batteries and have served me well. One of the four, though, seems to be in a weird bricked state. This particular battery was in the front of my RV in a battery box and I found it...