The ConnectClip is not made by Philips. It’s made by Oticon. Oticon is owned by William Demant, the parent company. William Demant also owns Sonic and Bernafon. William Demant licenses many of its hearing aid technologies out to Philips to make and sell its own branded hearing aids. The Philips AudioClip is basically a copy of the Oticon ConnectClip, licensed to Philips by William Demant. However, as far as I know, somebody had already tried to pair a Philips AudioClip with their Oticon hearing aids and they were not successful. It could have been the other way around, too (somebody tried to pair their Oticon ConnectClip with their new Philips hearing aid unsuccessfully), I just don’t remember. I just remember that they’re not compatible software-wise. But hardware wise, they’re the same device physically.
I’m not aware of any way to find out what the battery level in the ConnectClip is. You just use it until you get a low battery warning.