dangers of 1500mah LiPo
Oh goodness, just one li-po cells can burn your house down for sure. 

Li-po is one of the worst batteries for failure, both in frequency of failure and in intensity of failure. 
When a lifepo4 battery lights up it is fairly tame (a slow flame), when a li-po goes, it can be very violent. I can not say if this one will be violent or not, it depends largely on state of charge at time of failure. If the battery is completely drained the amount of energy it has in it, and the risk of violent failure is much less than if it is charged to 110% or more. 
In any case, dont be charging it on the carpet in your house unattended. You should just plan for it to light up when you aren't watching and then you won't be surprised.