We have a ClearOne Max conference phone at work that has been in need of a new battery for a while. When we do get new batteries for it, they never seem to last as long as they should and always need to be ordered in.
Solution: Use an RC battery pack.
The battery in the conference unit is a 7.2V 1800mAh NiMH battery pack. The RC battery pack is 3000mAH so we get much longer out of it on a single charge.
We're still able to use the normal charger that came with the phone too.
Sure it might be ...