I have tried them in years past, but they were awful. I once bought a used P&S camera, and went to replace the battery, but could not get it out, it had overheated and was bulging, stuck solid. I drilled several holes until I was able to collapse it and pull it out with some needle nosed pliers. It was a 3rd party battery. The camera came with a second identical battery that did hold a charge, but I tossed them both and bought the right one.
If its not a critical use, a brand that has a actual company behind it might be acceptable. I would not trust taking one on a aircraft, or for any use where I depended on the battery to be reliable.