@minion-queen I just tried this, and it works. At least the blue light came on. When I plugged it in, the red light flashed a couple times, and now the blue light flashes every so often, so I assume it's charging.
I'd sent one of these back to the company, and the replacement had the same issue. When I sent it back, they sent me two, and they both work. Yesterday I was saddened to see that the one I'd been using wouldn't charge, but at least I had the other one. Then I questioned their lifespan; if they'd sent me a dead one as a replacement, then two others just to be sure, their lifespan must be short. But after trying your method, I am once again hopeful. Thanks. I'm still keeping both of them.

@minion-queen I just tried this, and it works. At least the blue light came on. When I plugged it in, the red light flashed a couple times, and now the blue light flashes every so often, so I assume it's charging.
I'd sent one of these back to the company, and the replacement had the same issue. When I sent it back, they sent me two, and they both work. Yesterday I was saddened to see that the one I'd been using wouldn't charge, but at least I had the other one. Then I questioned their lifespan; if they'd sent me a dead one as a replacement, then two others just to be sure, their lifespan must be short. But after trying your method, I am once again hopeful. Thanks. I'm still keeping both of them.