[Robtao]

Here is what the Omnia 910 manual says:

"Using A Non-Supported Battery
Samsung handsets do not support the use of a non-supported
battery.
When using a non-supported battery, you will hear a series of
beeps and you will see a warning message that indicates “NONSUPPORTED
BATTERY. SEE USER MANUAL.” If you receive this
warning, battery charging has been disabled.
Samsung charging accessories (i.e. wall charger, and cigarette
lighter adapter) will only charge a Samsung approved battery.
To continue use of your handset, press down on the Optical
Mouse.
Note: When using a non-supported battery the handset can only be used for
the duration of the life of the battery and cannot be recharged.
Important!: Using a non-supported battery may cause damage to your

phone. Use a Samsung supported battery only."

It doesn't say "Samsung" only, but "Samsung supported" only. Probably meaning it has the magnet in it.

Please post if you come up with an extended battery that works for sure.