Hi guys- I have 2 lift foils I purchased in June 2020. I had one battery fail in June 2021 with less than 30 cycles on it, and it was replaced under warranty.
I am mechanically inclined, so I carefully split the case and inspected the cels inside. A couple of the 18650 cels had dropped below the voltage that the system would allow. I directly charged those cels VERY slowly at 1.5 amps until they got up to nominal voltage, and then the charger would engage and charge it. I resealed the case with silicone, and have used that battery for the past year. It finally dies about a month ago- the bad cels won’t take a charge anymore.
About a week after that, my remaining original battery gave me the yellow/violet leds, and then turned off entirely. I tried all the manufacturer suggested tricks, to no avail. My father is an electrical engineer and we are tracing out the BMS board to see if there is part of the board that went bad. It appears a transistor may be faulty, as the bms is not getting voltage from
The 12V input to the power terminals. More news as that develops.
I don’t not recommend opening your battery- there’s a huge amount of energy in that case, but if you do, there’s a possibility it’s salvageable.
I complained about losing 2 batteries in 2 years, they said I was way out of warranty and would offer me $1000 off the battery price for a replacement. After getting a manager on the line, I suggested the extend my warranty to 2 years as they had with all current customers, and he agreed. they covered the battery under warranty, which I received today.
They indicated they have changed a number of designs in the battery to address these previous problems. You should charge your battery every few weeks- especially if not used in the winter.
Hope that helps.