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Knowledge Base

Apparently, since 1897 (when Marconi patented wireless telegraphy) the amount of information for a given bandwidth (Spectral Efficiency) has doubled every two & a half years.

If it’s chilly, try turning the heating on – it may be just enough to get you through till morning.

Many people are treating Li-Ion batteries in the same way that older NiCd chemistry required, with regular full discharges to overcome the memory effect. In reality Li-Ion prefers frequent partial charges. However occasional full discharges are a good idea so the charge monitor can recalibrate itself as the battery ages:

• Don’t buy a spare battery (wait till you need a replacement) but if you do - run it down to about half charge (40% ideally) & store it in the fridge (not freezer). Allow to warm up & then charge before using.
• Don’t let it get too hot:
• Don’t leave it in direct sunlight (especially in a car or conservatory)
• When running your laptop on (reliable) AC take the battery out

I came across this interesting definition of dielectric recently – "a substance that can be penetrated by an electric field but not by an electric current".