Just wanted to update you guys so I went ahead and bought one for vertex vx-824. It was the 2600mah battery. First off, it looks identical to the vertex oem 2000mah that costs 3x the cost. It does feel slightly heavier compared to the oem but barely noticeable. So I ran 3 tests with the battery save option turned off. I have the backlight set up to turn on whenever I press a key, which is often since I change channels often. The transmit output is at high power (5 watts)
1. Receiving only, no transmitting. The battery lasted nearly 22 hours.
2. Light transmitting activity. The battery lasted alittle over 18 hours.
3. Moderate/Heavy transmitting activity. The battery lasted nearly 15 hours.
I've only had the battery for a week but I'm very impressed. I don't need to carry a spare battery anymore which is a plus but I probably will anyway. But if I happen to forget my spare, then I can be at peace knowing that the battery will last me for a typical 8-12 hour shift if it's fully charged beforehand. Oh yeah, I forgot to mention I have a Bluetooth adapter attached to the radio that draws power from the battery. Pryme advised me that the adapter uses about 20mah of power an hour.