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Why we believe all our batteries
are the best on the planet |
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Custom design and manufacture of state-of-the-art battery chargers, DC/DC Converters, battery packs and power supplies for OEMs in a Hurry
We
know that it is risky to try a brand of batteries that is not name-brand. Discount batteries often disappoint. That is not the
case with PowerStream batteries. Let us explain.
We at PowerStream have been designing custom battery chargers for
years. We have an extensive test facility in which we can evaluate batteries and battery charging algorithms under all kinds of
conditions.
One day we got in a batch of NiMH batteries to test from a no-name manufacturer. They were so superior to the
name brand batteries that we were testing at the same time that we were surprised. We contacted the manufacturer who offered
distribution rights to us and gave us surprisingly good pricing.
All batteries are made in factories with ISO9002
certification and extensive quality control and manufacturing control. Ten percent of their staff is devoted to quality control
at all levels.
Unlike many no-name factories, who have a recipe and follow it, our partners maintain a vigorous R&D
effort to improve the capacity, lifetime, and consistency of their products.
Technical details
of the quality of our batteries:
All battery packs are made with matched batteries to prevent early failure
due to cell reversal. The cost of doing this for us is very low because of the extreme consistency of our cells.
We know
that one size does not fit all. Batteries are always made with tradeoffs. The most important are size, price, capacity, and
maximum discharge current. Our partners are willing to modify their process to better serve your requirements. For example if
you need 50 amps of discharge current we would reduce the amp-hour capacity to make a cell with lower electrode resistance. If
you only need 1 amp of discharge current we could increase the amp-hour capacity. Similarly it is cheaper to get 1 amp hour out
of a large battery than a small battery, so flexibility on the part of the battery manufacturer can be important.
The
following chart shows the quality of the PowerStream NiMH 4/3 Fat A cell, which is rated at 3850 mAH.
| Current |
Measured run time |
Expected run time |
Ratio |
Equivalent AH |
| 0.525 A |
440 |
440 |
1 |
3.85 |
| 1.02 A |
226 |
226 |
1 |
3.85 |
| 1.5 A |
150 |
153 |
0.98 |
3.78 |
| 2.0 A |
114 |
115 |
0.99 |
3.80 |
| 2.5 A |
91 |
92 |
0.98 |
3.79 |
| 2.98 A |
75 |
77.5 |
0.97 |
3.72 |
| 3.5 A |
64 |
66 |
0.97 |
3.73 |
| 4.0 A |
56 |
57.8 |
0.97 |
3.73 |
| 4.5 A |
50 |
51.8 |
0.97 |
3.72 |
| 5.0 A |
44 min |
46.2 |
0.95 |
3.67 |
In this chart the "expected run time" is what you would expect if you took the capacity measured at a
C/20 discharge rate and divided it by the the discharge current. You can see that even at 0.77C, the PowerStream cells are
still up to 95% of their 20 hour capacity. This indicates a high quality, well constructed cell that was designed for high
current capability.
For a chart of the sizes and weights of cylindrical batteries click
here:
For more battery engineering resources click here:
Note: We don't inflate our specifications as many companies do. The
capacity in amp-hours is guaranteed, and will be exceeded most of the time. "Usable cycles" is a guideline, but not guaranteed
because we have no control over abuse of the cells. |
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PowerStream Technologies: 1163 S. 1680 West. Orem Utah
84058
Phone: 801-764-9060
Fax: 801-764-9061
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© Copyright 2000, 2002, 2003, 2004, 2006, 2009, 2011 Lund Instrument
Engineering, Inc. All rights reserved This material is copyrighted original work. It is forbidden to use this
information, text, or graphics in full or in part on another web site without written permission. |
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