i was wondering on the web to fin the better way of bulk charging my 18650 cells one capacity tested, many ppl use cell holders, some use custom holders. I came up with a solution that require no more than aluminum foil small magnets and your regular li-ion charger (mine is an Imax-b6).

take care to parallel cells that have only a small voltage difference, ideally you want no more than 150 (should be safe enough) ma between cells wen connecting them in parallel.