Acer :: Aspire 5920g Battery Wear Level 49%

I bought this laptop 5 months ago and I have been monitoring it slowly deteriorating by battery life, it is a 6 cell 4400mAh battery and I use it every day, and make sure not to let it drop below 10% battery power as to not do full discharges and only partial.

I was getting 1hr 50 mins when I first got the laptop which may have been max or min settings I cant remember but anyways which seems not as good as the advertised 2.5 hr battery but I can understand that advertised and actual may differ and max, min would have had an effect. Anyways now after 5 months (Purchased early december) I am only getting 58 mins on full charge at minimum settings, now this does seem quite ridiculous and NHC is reporting 49% wear level.

My question is, is this normal for a Li-Ion Acer battery after 5 months, it seems quite bad to me, and all I can think is the laptop was left on the shelf for a while before i bought it, or that it is defective. I rang acer warranty support and I feel quite fobbed off with them saying this is normal and usage patterns and that their warranty for batteries only last 6 months and I should expect only to get 1/4 of the full charge i did when i purchased after 6 months. So acer is in the business of making low quality batteries?