2006 Ford Mondeo 2.0 TDCI Ghia Wont start sometimes especially when cold. Battery still has full power

Problem added: Jul 23, 2020 (1 week ago)
Car won't start sometimes. Put ignition on and after the glow plug light disappears ,turn the key and the speedo and rev counter go right round to max and sounds like a click as if battery has died or no kick to start it. The car start with a booster pack.
When the car does start normally or with booster ,it will start but will take a good few seconds before it gets any power to move.

Car details
Car: Ford Mondeo
Variant: 2.0 TDCI Ghia
Model Year: 2006
Category: Running Rough, Starting & Power Loss

Recalls: Ford Mondeo Recalls
More: Ford Mondeo Problems
Parts mentioned in this problem
Replies and fixes
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whittingehame
Fixes: 12,473
Jul 23, 2020 (1 week ago)
If you LOAD test your battery , probably find it needs replaced .
Jul 23, 2020 (1 week ago)
Thanks for the reply. I have tested battery and alternator, both seem to be working on full power.
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whittingehame
Fixes: 12,473
Jul 23, 2020 (1 week ago)
What battery voltage in battery ?
Jul 23, 2020 (1 week ago)
12.4 when still. 16ish when running.
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whittingehame
Fixes: 12,473
Jul 23, 2020 (1 week ago)
If the battery is reading at 12.4 volts, then it’s 75% charged .If it's charging at " 16" ish , it is overcharging . Battery / alternator or both knackered
Jul 23, 2020 (1 week ago)
Thanks for help. Will look into it.
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