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Old 08-25-2015, 02:17 PM   #21
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Walt, have you considered Eneloop Pro?
Less of a trade-off capacity and power wise vs. Powerex.
And it is still a low discharge battery vs. regular discharge Powerex.
I hadn't known about them but I'll consider them when it is time to replace the batteries I have. Thanks for the info.
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Old 08-25-2015, 03:48 PM   #22
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Originally Posted by growing_older View Post
I'm so sorry to hear this. Back in the day when we were big producers of battery operated industrial gear we did a lot of battery tests and Duracell copper top were always the best performing and most reliable. We recommended them (for free, no relationship) in all our manuals. It's disheartening to think that they have been swept up in the commodity manufacturing of batteries and are no longer superior. Now, I feel old.
I have an emergency location transmitter ("ELT") in my airplane that takes D batteries. The manufacturer specifies Duracells, and the "diligent" FAA-authorized inspector rejected my previous use of Eveready brand cells due to that recommendation, thus I replaced them with Duracells. So now I've probably got an ELT that is less likely to function when needed and more likely to be destroyed by leaky batteries, but it complies with the FAA requirements. Great.
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Old 08-26-2015, 06:44 AM   #23
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I have an emergency location transmitter ("ELT") in my airplane that takes D batteries. The manufacturer specifies Duracells, and the "diligent" FAA-authorized inspector rejected my previous use of Eveready brand cells due to that recommendation, thus I replaced them with Duracells. So now I've probably got an ELT that is less likely to function when needed and more likely to be destroyed by leaky batteries, but it complies with the FAA requirements. Great.
I would visually check them from time to time. Does the ELT have some sort of voltage monitor or some way of letting you know the batteries are getting low? I always thought ELT's had some sort of special battery. That's interesting.
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Old 08-26-2015, 07:54 AM   #24
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I would visually check them from time to time. Does the ELT have some sort of voltage monitor or some way of letting you know the batteries are getting low? I always thought ELT's had some sort of special battery. That's interesting.
There's a panel-mounted indicated that tells me if the device is operational, but not the specific battery state (or if they are leaking).

Most ELTs do use a special battery. One of the selling points of this old unit is that it takes regular D cells (which are lots cheaper and generally just as good for this purpose). Anyway, ELTs have changed technology in the last 5 years, and it is time to upgrade mine to the newer 406 MHz unit. The new unit has a lithium battery that is good for 5 years--and costs $130 to replace (I can buy a LOT of D cells for $130).
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