I've had a Elinchrom Skyport set for a good number of years and the rechargeable receiver battery appears to be getting weak and doesn't hold a charge long. I found a thread that shows the unit open, but I didn'r see any mention of where to get a replacement battery. Evidently the battery is one used in a cell phone and is a LI-ION 3.7vdc 900mah with a number 940050 and appears to have leads on it. My Google searches came up mostly empty. I did find one that was close, but it had contacts rather than leads. Any ideas for a source would be welcome.
Note: I'm in the US