Works, but are this reliable?

Slightly different original battery that came with the device. Lighter and darker gray. After the loading time and the same and use, even when we notice a difference (it discharges nearly 2x faster than the original). Meanwhile, it helps out and after a month of use, no major problems. I just hope not burn my device with an unsuitable product, and that these differences are merely uses different manufacturing materials, or range may be oldest of this type of batteries.
Otherwise, sending fast and neat.