Entertainment 7000 Keyboard Power

I have an Entertainment 7000 Bluetooth Keyboard installed in my Vista
system. Yesterday the keyboard lost all connection with the PC. I replaced
the batteries in the keyboard and reinstalled it and it now works fine. I am
presuming that low battery power was the cause. I would have expected a low
battery warning, can anyone tell me if MS Intellitype includes a power
warning facility?

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jel183(UK)
Vista Ultimate x86
MS Office 2003 Standard Edition