Consumer grade batteries fall short in a number of areas:
- poor construction, do not meet the same vibration/drop test specifications as industrial cells
- poor electrical performance, significantly higher internal resistance than the worst of the industrial offerings
- exagerated specs to meet the consumer demand for more PWR
At reasonable levels of current consumption, these cells fall short of the worst of the industrial NiMH's...
Dick Barker wrote:
No Way!! For the same package size decent (Sanyo) nicads have higher terminal voltage under load, lower internal resistance, faster dependable charge and discharge rates and a much longer charge retention time.
I will admit that NiMH cells have more capacity per volume than NiCads but you must use it within a day or so and can't get it out at high rates with high terminal voltage.
Stick any AA NiMh cells you can get in a digital camera and put it in your pocket for a month - then try to take 8 or 10 pictures with flash, Didn't work did it? Now try the same thing with a pair of 650 to 850 mAh NiCads. No Problem getting the pictures!
NiMh cells are fine if you charge every day, don't need high terminal voltage, and have no need for real reliability. Great product for mp3 players but not for anything critical.
You can get NiCads with some of the same problems as NiMh cells if you pick the ones that have boosted capacity by using foam plates to increase the capacity.
-- Simon Van Leeuwen RADIUS SYSTEMS PnP SYSTEMS - The E-Harness of Choice Cogito Ergo Zooom
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