Design features:

1)  The pictures show that you can remove the battery pack by sliding back on the case, and the pack pops out of the calculator base.  This is similar to the original HP battery pack

2)  Using stainless steel springs very similar to the original springs.  

3)  There are two thin metal flaps that hold the batteries in the case so they will not slip out while you insert to remove the battery pack.  

4)  Four N-cells included.  I'll refund $6 if you do not need the four alkaline N-cells.

5) the third picture compares the original HP case (right case) to my 3D printed case (left case).  They look very similar.

Shipping is $4 inside the USA and $17 for international customers.  

I will guarantee this battery pack for 90 days, and if you are unhappy with it at anytime, I'll refund if you mail it back to me.  Please check out my other auctions for HP calculator batteries and accessories: Different battery packs, Orings and instructions, USB charging cables and Stand-alone charging boxes if you search on eBay for waterhosko

Shipping:  For multiple battery pack purchases contact me for actual shipping costs. I will refund your extra shipping charges and only charge you actual shipping costs.   BTW, 93.9% of my sales are mailed in one day.