Bontrager Light Battery Question

I have been using the compact Bontrager flare and ion white and red lights for about two years. Early on I could get say 8 - 10 hours of intense flashing from each of my units. Nowadays I'm lucky if a fully charged light lasts for three hours. Is it possible to buy a replacement battery? Second question. Why has TREK stopped selling Bontrager lights? Is Bontrager going out of business? Thanks in advance for your replies.