This charger?
http://www.grimsbymodelcentre.co.uk/Public/Content/Product.aspx?ProductID=954
If you run 4s or 2x3s batteries, that one will work. however, you said you planned on getting 2 6s packs. So what I was saying above, for 6s, you will be both a) having long charge times, and b) be running your charger a max wattage all the time. If you can't step up to a 200w/channel or better charger, then get it, it will work. I would advise running the math and keeping the charger around 80w-90w per battery, which is about 3.5a-4a for a 6s lipo.
A quick look at Banggood shows me this one, 2 channels, 200w per channel. This would give you the power for 1c charging of 6s bricks. £115, free shipping.
https://www.banggood.com/EV-PEAK-CD...-1167774.html?rmmds=category&cur_warehouse=CN
http://www.grimsbymodelcentre.co.uk/Public/Content/Product.aspx?ProductID=954
If you run 4s or 2x3s batteries, that one will work. however, you said you planned on getting 2 6s packs. So what I was saying above, for 6s, you will be both a) having long charge times, and b) be running your charger a max wattage all the time. If you can't step up to a 200w/channel or better charger, then get it, it will work. I would advise running the math and keeping the charger around 80w-90w per battery, which is about 3.5a-4a for a 6s lipo.
A quick look at Banggood shows me this one, 2 channels, 200w per channel. This would give you the power for 1c charging of 6s bricks. £115, free shipping.
https://www.banggood.com/EV-PEAK-CD...-1167774.html?rmmds=category&cur_warehouse=CN