LiPO 18650 quick-release charger stand

I needed a battery holder for 18650 Lithium batteries that would allow for quick-changing the batteries while I test and sort recycled batteries from laptops and cordless drills. This is my third major revision and I'm pretty satisfied with the results. Uses nickel .375x.005" straps (www.sunstoneengineering.com part no. SN375N54 or similar) as the contacts, which are easily solderable, and recycled bits from a Lithium battery balancing adapter. The individual trays can be stacked together and