Hi. I've been observing some forums and responses about LUXOS U. Thanks for your shares and thoughts here!
I don't have this product, but I'm interested in this solution too, as it solves (or should?) main problems for bicycle tourer's concerns: USB (out: 5 V, min 500 mA), stable current (GPS with no battery), good lamp in one bundle. It's obvious, that specs may be reached only by using cache accumulator and it's clear, that this component will not last long (especially for tourers, running device for a long time/distance).
Rechargeable batteries have a limited life time (age) due technology they use. They degrade and need a replacement after some (~2-3+) years (it depends on battery type, capacity, cycles, temperatures, how it's used & etc...). It's true, as those accumulators, that are Li-Ion, LiFePO4 and other Li+something are more advanced, but – dangerous and usually in that case – non standard, need a dedicated controller/charger, and most important – they can easily get into the flames and even may burst on wrong usage or damage (we know a lot stories about smartphones and laptops on fire). So, it's nothing unusual, that manufacturers use non replaceable (or not easy replaceable) batteries of this type, out of reach for inexperienced customers.
There's no information about it's life time on web and BUMM support do not reveal it. I've wrote 7 emails to them to find out, how long I should expect this thing to be functional, or any technical data about battery they use, to predict it's death or even replace by myself or local electronics specialist. Finally, I understood, that support may been instructed not to give answers about that at all: "I do really understand your misgivings, but I do not have other information for you."
Owners: is it possible to open it and look inside – any markings on battery or it's welded „black box“? But I don't recommend to do this, as warranty may be void after that
All I've got useful was: "you can load the cache battery about minimum 500 full cycles (e.g., 10x with 10% of the capacity loaded and unloaded)", or their service can replace dead battery: „You have a warranty period of 2 year by your dealer. But if there is a malfunction on the cache battery, we can replace it for sure free of charge. We cannot give you the exact name of the cache battery..." and "if there would be a malfunction of the cache battery or of the light, it doesn't matter to us, how old the light is. We would replace it for free." Doesn't look convincing, does it?
Maybe there are more notes on paper in product box about battery and life time? I can't find even working temperatures of it in web-PDFs. All it's said: "lithium cache battery" (it's obvious, that it's not only lithium, but lithium + something as "pure" lithium batteries usually are not rechargeable) and "Please note: Never dispose of worn-out rechargeable batteries or electronic parts with your domestic waste but discard as hazardous waste!". That's all we get in PDF online manual
It's obvious that some electronics manufacturers deliberately hide this information, as they plan to offer new products after about warranty time ends and keep business running. There's no interest to make a long lasting thing nowadays. Sure, there are fair manufacturers, that say to a customer: yes, it's not only a warranty time, but it's near about the same product's life time, as battery is inbuilt, it gets worn and non replaceable; after of 2-3 years (?) of use, you should know, that this item is going to a trash bin. It's justice then. But BUMM tell me nothing about that.
Easy replaceable accumulator (like in mobile phones) for this kit may be good thing, but it may rise product size and price too. I hope, It's another step in product development, as sealing it from water ingress too (but it should be vented, as it's large and may create condensate in it). Most of us want this thing to be used outdoor in harsh conditions (rain, sun and frost) and predicting it's life time in order not to stuck with it in remote areas.
BTW, I'll add
another report about strange light behaviour.
When driving in daylight and greater speed (approx.> 20 km / h) can no longer turn off the headlights. Under the pressure of the spotlight 3s goes for about a few hundredths of a second and immediately back on.
Comments to a picture above: wire loop down and up, prevents water main stream running straight to the lamp's connector, and wiring it through mount, should keep it tight connected.
P. S. Sorry for my poor English.