If you're wondering about what makes an SR cell or finished pack different, here's a short list of just some of our exclusive features:

• All SR cells are screened and matched Aerospace Grade cells. These are not your usual consumer type inexpensive cells. They are exactly the same cells we use for our military/aerospace applications.
  
  
• Only SR guarantees its cells and packs not to ever form a memory and warranties each pack for one year.
  
  
• Only SR puts every pack through five days of electronic testing to make sure every pack is perfect. These tests include a test of capacity, charge retention, and a vibration test for mechanical integrity.
  
  
• All welded internal and external construction. Would you believe that some companies sell cells where the internal connections are nothing more than a press fit? We don't even have soldered connections, except for the connector leads themselves.
  
  
• Even the straps we weld from one cell to another are an SR exclusive. Our oversized straps are strain relieved so that no vibration or stress is transmitted to the welds at the end of each cell. No one else has this feature!
  
  
• All SR packs can be fast charged. Of course no cell will stand up to extreme overcharging but all SR cells have the lowest possible internal impedance so that fast charging isn't a problem.
  
  
• Custom packs. Now, that's what we're all about. While other companies force you to buy what they make, we sell you what you want. A 5 cell pack rather than a 4 cell pack? No problem! 36" leads on the pack? No problem! A special shape pack? No problem!

Cells are sold two different ways. You can buy loose, screened and tested but unmatched cells with or without solder tabs. Or, you can buy matched cells either loose or in a finished, welded, wired pack less connector. Connectors and any other custom features you might like are a small additional charge. Contact us with your specifications and we'll be glad to give you an exact price.

For suggestions as to how to describe a particular shape pack, click here... Pack Shapes

Matched cells go through a five day process where they are matched for capacity, internal impedance, and characteristic discharge curve. For critical applications, matching is a must. Finished, welded packs are always made with matched cells.

Because the assembly of loose cells into a finished pack by the end consumer is outside of our control, there is no warranty given with loose cells.

Standard Series Cells are generally used in applications where high capacity, charge retention and long life are the priorities. Internal impedance's are a little higher so although Fast Charging is fine, load and charge rates should be limited to 2C or so.

"H" Series cells are NiMH.  Series without an "H" are NiCd.

High Rate Max Series Cells are designed for charge rates up to 3C and extremely high discharge rates. They are used in applications where the time available to charge the pack is short or where the discharge current will be very high.