It is perfectly normal if your battery health (maximum capacity) is more or less than 100%, even when brand new, or if it fluctuates up or down over time. For further details, read the CHECKING STATUS AND HEALTH section of the following link.
This should answer most, if not all, of your battery questions:
my 2011 got down to 93 percent and is back up to 97 percent after using the battery a bit. if it lives on AC, the battery won't be used and will degrade.
my 2011 got down to 93 percent and is back up to 97 percent after using the battery a bit. if it lives on AC, the battery won't be used and will degrade.
It means that the battery is losing its charge because it's not being used, and the charger won't recharge the battery until it hits about 93 %. Nothing to be worried about, it's nothing else than an indicator of how much the battery is charged.
The other replies seem to be concerning your battery health, but you're talking about the charge - not the health.
That's not the only scenario. It could also mean that enough demand was placed on the system that it drew power from the AC adapter and the battery, draining the battery somewhat. This is normal.
Having the laptop for five days, apparently being quite clueless and talking about the percentage at the top, I'm guessing it's the charge percentage...