I use these peeps, just bought 3 Skyrich's from them, excellent price & service. MSR | Batteries & Chargers | SPS Lithium Ion Batteries Having blown serious wedge on Ti fasteners on past projects over the years... It's a stupidly cheap way to drop weight. After weighing in with a 3kg difference(the total weight of the Micron pipework I'm selling!!) chuffed I most definitely am!
