This is a genuine Ryobi battery, not a cheap non branded "for Ryobi" battery.

Due to its bigger size, you cannot fit it into three skins(refer to photo) 

This battery is a high-performance version. It has 3 sets of cells, which can provide over 2000 watt power output and 50% longer run time than 5Ah one.

Please be aware there are three skins do NOT work with this battery, referring the LAST item photo