The laptop charges at a much slower rate than the wall charger.

Everyone knows charging a battery slowly is much better for it than charging it fast, also you will notice that charging the battery from the wall only charges up to around 92-96%.

Anyway buy a lower mA charger from ebay - around the 400mA mark. Which is more than enough time to charge overnight.

Also recently on my N9 at around 8pm it shutdown because it said 0% battery, I powered it back on and said it was 12%, it then lasted until 11pm/12am, this could also be the case with your phone and charging it slower prevents this issue.