Higher temps when no battery in the system

[alexzabr]

Since my T43 regular (6-cell) battery is affected by the recall and I was advised by the service not to use it until the replacement will arrive, I took it out of my machine and work with AC adapter only.
I noticed the tempratures went a bit higher in this condition then they used to be when the battery is inside. Not something critical, but strange to notice, I wonder why...
(in general several locations exhibit higher temps then usual by 4-7 degrees).

Any thoughts why ?

[DIGITALgimpus]

Could be that gaps normally covered by the battery are now open, so rather than having a more forceful flow of air from one end to the other it's disbursing more, causing weaker air flow and circulation.

[alexzabr]

Yes, can be indeed airflow issue..didn't think about it myself