The connection to the wall is not likely to cause the battery to swell. If the AC adapter has a two prong plug, it does not matter which way around it is plugged in.

If the AC adapter has 3 prongs (one ground) it will be inserted to the power connectors the correct way.

Swelling (if it occurs) is normally from continued charging to a very high charge level and left connected. I do not see swelling very often. A swollen battery can leak because of the swelling.

Leaving a computer connected to AC should be limited to around 75 to 80% charge.

It also simply could be the battery age (no guarantee as to specifically how long any battery will last).

I suggest you replace the battery as soon as you can (leaking as I noted earlier), and then not leave it plugged into AC all the time.

The connection to the wall AC outlet is not likely to cause the battery to swell. If the AC adapter has a two prong plug, it does not matter which way around it is plugged in.

If the AC adapter has 3 prongs (one ground) it will be inserted to the power connectors the correct way.

Swelling (if it occurs) is normally from continued charging to a very high charge level and left connected. I do not see swelling very often. A swollen battery can leak because of the swelling.

Leaving a computer connected to AC should be limited to around 75 to 80% charge.

It also simply could be the battery age (no guarantee as to specifically how long any battery will last).

I suggest you replace the battery as soon as you can (leaking as I noted earlier), and then not leave it plugged into AC all the time.

The connection to the wall is not likely to cause the battery to swell. If the AC adapter has a two prong plug, it does not matter which way around it is plugged in.

If the AC adapter has 3 prongs (one ground) it will be inserted to the power connectors the correct way.

Swelling (if it occurs) is normally from continued charging to a very high charge level and left connected. I do not see swelling very often.

Leaving a computer connected to AC should be limited to around 75 to 80% charge.

It also simply could be the battery age (no guarantee as to specifically how long any battery will last).

I suggest you replace the battery, and then not leave it plugged into AC all the time.

The connection to the wall is not likely to cause the battery to swell. If the AC adapter has a two prong plug, it does not matter which way around it is plugged in.

If the AC adapter has 3 prongs (one ground) it will be inserted to the power connectors the correct way.

Swelling (if it occurs) is normally from continued charging to a very high charge level and left connected. I do not see swelling very often. A swollen battery can leak because of the swelling.

Leaving a computer connected to AC should be limited to around 75 to 80% charge.

It also simply could be the battery age (no guarantee as to specifically how long any battery will last).

I suggest you replace the battery as soon as you can (leaking as I noted earlier), and then not leave it plugged into AC all the time.