Also, there isn’t much difference in size and cost. I generally only buy the 12ah and 9ah batteries for the accessory items I need them for. If you have other items like black light, spot light,… pair of clips and a cigerette lighter adapter and your set. I see Battery mart has a special for 16.95 less a $5.00 instant savings on the 7ah batteries. I think I paid about $12.00 to ship a 2 pack on my last order
Battery Mart