OS X reports %74 keyboard battery for brand new fully charged batteries

I just placed three brand new fully charged 2450mAh Energizer batteries into my wireless keyboard and OS X reports that it is only %74 charged. Previously I had the same result with rechargeable Duracell batteries but using non-rechargeable batteries OS X reports %100 battery when using new batteries. Is this normal?

The reason just may be that rechargeable batteries no matter what kind (ni-cad, HMDS, or Lithium) are 1.2v batteries rather than 1.5v's like Alkaline batteries. That is why the keyboard and mouse instructions state that, "rechargeable batteries may be used." Which implies to me they are not the first choice of Apple. In all probability, the battery level is in fact calibrated for 1.5v batteries.
No matter, rechargeable's will work fine with more frequent replacement. A handy spare set solves the problem.
virg

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Battery Information:
Charge Information:
Charge Remaining (mAh):          942
Fully Charged:          No
Charging:          No
Full Charge Capacity (mAh):          4529
Health Information:
Cycle Count:          0
Condition:          Replace Now
Battery Installed:          Yes
Amperage (mA):          0
Voltage (mV):          11188
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System Sleep Timer (Minutes):          60
Disk Sleep Timer (Minutes):          10
Display Sleep Timer (Minutes):          20
Automatic Restart on Power Loss:          No
Wake on AC Change:          No
Wake on Clamshell Open:          Yes
Wake on LAN:          No
Current Power Source:          Yes
Display Sleep Uses Dim:          No
PrioritizeNetworkReachabilityOverSleep:          0
RestartAfterKernelPanic:          157680000
Battery Power:
System Sleep Timer (Minutes):          10
Disk Sleep Timer (Minutes):          10
Display Sleep Timer (Minutes):          2
Wake on AC Change:          No
Wake on Clamshell Open:          Yes
Display Sleep Uses Dim:          Yes
Reduce Brightness:          Yes
RestartAfterKernelPanic:          157680000
Hardware Configuration:
UPS Installed:          No
AC Charger Information:
Connected:          Yes
ID:          0x0100
Wattage (W):          60
Revision:          0x0000
Family:          0x00ba
Serial Number:          0x00f46317
Charging:          No
Power Events:
Repeating Events:
Type:          Wake or Power On
Time:          07:30 00AM every day

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OS X reports %74 keyboard battery for brand new fully charged batteries

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