Whats going on?

[R1 GTR]

Ive had my laptop plugged in on the desk for ages now (few days) so obviously the battery is fully charged. The icon in the bottom right corner says "on AC power" as normal. All of a sudden it changes to "charging 95%". Whats going on?

[PJ S]

Perfectly normal - whilst the mains is connected, the battery is monitored and topped up when it falls back to a pre-determined level.
If you're going to use the mains, then you're best to remove the battery altogether at around 40%.
Either that or remove the mains once the battery is fully charged, then reapply once the level drops to 50% or less, and before the laptop self sleeps due to lack of power.