I run both Ping battery packs and Headway packs. I find the Headways are a bit saggier voltage-wise, and a bit heavier. The Headway packs are easier to maintain, as you can fairly easily take the whole pack apart and put in a new cell or plastic cell blocks or whatever - the modularity is good. The Ping batteries also have issues with heat production by the stock Signalab BMS from Ping, so that charging them in a cooler pack can overheat the bms. I haven't noticed this issue with the Headway pack BMS - much better heat dissipation with the big aluminum heatsink on the board. In fact I've replaced several Signalabs with the Headway bms, on the Ping packs. The Ping packs are a bit lighter and more compact. They are about the same pricewise for the same energy content. The Headways are supposedly rated at 3C continuous I believe whereas the Pings are 2C. I like both brands, with a slight edge to the Headways, for modularity, diagnostics and repair, and have assembled several packs from the raw cells and plastic blocks and connectors.