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I'm pretty sure the battery is not to blame. They will almost certainly use a charge pump design for the LEDs. It is however quite normal that LEDs degrade over time. All do, but in how much there's a wide variance. They also might change their color a bit.
That said, given how long the device is on the market, I estimate a maximum usage time of ~5000 hours. That isn't very much for LEDs.
Not wanting to sound accusing, but there's also a psychological factor to consider. Who isn't sitting in front of a device right now that seemingly got a bit slower each day compared to when it was new? ... (Yes there are reasons why that might in fact be the case, but often enough, it's just perception)
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