This is the ultimate battery tray for your Newton 2000 or 2100.  it is designed so that you can easily use standard AA batteries to power your Newton but it also has the contact points to allow you to use it with rechargeable batteries by soldering the Polyswitch Fuse to the rechargeable batteries (provided with auction) as well as a thermistor (also provided with auction).  You can get your Newton up and running in no time.  

The holder is made from high strength polycarbonate and inserts and ejects from the Newton exactly as an original battery tray which are increasingly difficult to find. Instructions on how to configure it for different modes of operation (standard cells or rechargable) are provided. 

Any questions please ask.