Only bought it because I was sick of every cnut stealing my Makita batteries on site and left my Makita impact driver at home one day...some of my erbauer batteries have been going 3 yrs,bashed to bits,Ive got everything they do thats battery powered,impact,re sip saw etc.even a chainsaw..wouldnt use anything else now mate,the batteries are half price of Makita, the evolution works 9ah big batteries fit all erbauer kit too,and only £100. Its a no brainer,more power and last longer than the Makita equivalent...and best of all,all the little chocolate boys dont steal the batteries or chargers,th