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  #1  
Old 05-11-2022, 07:29 AM
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Gauntlet Gauntlet is offline
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Default 9V Rechargables

Yes I know, 9V is outdated, blah-blah-blah Some us aren't just old, but old school

Last batch I'd purchased is getting low, and looking at them yesterday, like everything else, are overpriced. So I did a bit of reading last night and read where many of the 9V rechargeable fall far short of 9V following recharging.

Then I'd read about these:

Powerex MH-C490F Stealth Two-Hour Compact 4-Bank NiMH Battery Charger Kit with Included 9.6V Batteries



Which charge to 9.6V. They aren't cheap ($90 for 4 batteries and charger), but are supposed to be good for over 1000 charges, which will be much cheaper than buying disposables in the long run. Traced them to AMZ, then went to sellers site and purchased for the same price (as well as free shipping).

If you have had any experience with them, feel free to chime-in, good or bad, so I know what to expect If not, I'll come back after having the chance to use them.

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Tesoro: Vaquero, DeLeon, Cibola with GB mod, and Compadre (with coil swap and 3-D mods).
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Before buying a Nokta Makro look at my thread:
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  #2  
Old 05-11-2022, 07:44 AM
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I've used the Powerex AA batteries with charger and they did great. I had no complaints.

Cliff

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  #3  
Old 05-11-2022, 08:35 AM
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I use Kastar 9v rechargeable batteries. These you can plug right into almost any common cell phone charger that utilizes a micro USB. I've had them for a few years, and have not noticed any loss of memory, and they can last much longer than a standard 9v. I would absolutely recommend and buy another set if I ever needed too.
Kastar 2 Pack Micro USB Rechargeable Li-ion Polymer 9V Battery LI9V Works with Toys, Clock, Multimeter, Digital Camera and Game Controller as 6F22 https://www.amazon.com/dp/B079163159...8F7GS0S42D4AB2
15$ for 2 seems much more reasonable as well. They have a button on the side that has 3 LED's, so when you push the button, it should show you the level of charge. I have noticed this feature does not work very well, but other than that, they have worked flawlessly.

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  #4  
Old 05-11-2022, 10:37 AM
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Originally Posted by Bayoutalker View post
I've used the Powerex AA batteries with charger and they did great. I had no complaints.

Cliff
Thanks Cliff, good to know! I'd have to think the satisfaction would be the same for the 9V's. They have extremely good reviews (thousands).

Originally Posted by cellrdwellr View post
I use Kastar 9v rechargeable batteries. These you can plug right into almost any common cell phone charger that utilizes a micro USB. I've had them for a few years, and have not noticed any loss of memory, and they can last much longer than a standard 9v. I would absolutely recommend and buy another set if I ever needed too.
Kastar 2 Pack Micro USB Rechargeable Li-ion Polymer 9V Battery LI9V Works with Toys, Clock, Multimeter, Digital Camera and Game Controller as 6F22 https://www.amazon.com/dp/B079163159...8F7GS0S42D4AB2
15$ for 2 seems much more reasonable as well. They have a button on the side that has 3 LED's, so when you push the button, it should show you the level of charge. I have noticed this feature does not work very well, but other than that, they have worked flawlessly.
Out of curiosity, would you happen to know the full-charge voltage? I'd looked (somewhat, though briefly) and didn't see any others with a 9.6V full charge voltage.

While the 4 batteries I'd ordered will give me spares (unless I loan someone a MD and PP), the 2 hour charge time was a bonus as well, though I don't know what situation I'd ever be in where that would be an issue. If there were, I could still swap in a regular alkaline.

Thanks! And it's good info for someone else who may be in the market.

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Tesoro: Vaquero, DeLeon, Cibola with GB mod, and Compadre (with coil swap and 3-D mods).
Fisher: 1265X
Before buying a Nokta Makro look at my thread:
https://metaldetectingforum.com/showthread.php?t=295281

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  #5  
Old 05-11-2022, 11:38 AM
MuddyMo MuddyMo is offline
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Never owned that brand but bought EBLs in a 2 pack and a 4 pack. In a year one charger and 2 of the batteries croaked. I didn't think they lasted near as long per charge as an alkaline so Im not sure they're worth it when you can get 8 alkalines for $12.

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  #6  
Old 05-11-2022, 09:22 PM
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I use the Powerex 9.6 batteries to power my home brew trail cams and they work well...saving money for sure over the alkalines

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  #7  
Old 05-14-2022, 07:55 AM
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Originally Posted by MuddyMo View post
Never owned that brand but bought EBLs in a 2 pack and a 4 pack. In a year one charger and 2 of the batteries croaked. I didn't think they lasted near as long per charge as an alkaline so Im not sure they're worth it when you can get 8 alkalines for $12.
I looked this brand up, and looks like their full charge operating voltage was only 8.4V. This was why I'd chosen the brand I did, over 1V more.

And you know what they say about more power Thanks!



Originally Posted by Jose159 View post
I use the Powerex 9.6 batteries to power my home brew trail cams and they work well...saving money for sure over the alkalines
Good to hear, Thanks!

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Tesoro: Vaquero, DeLeon, Cibola with GB mod, and Compadre (with coil swap and 3-D mods).
Fisher: 1265X
Before buying a Nokta Makro look at my thread:
https://metaldetectingforum.com/showthread.php?t=295281

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  #8  
Old 05-14-2022, 12:15 PM
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Delivered today, I guess I'd forgotten the mention of a 12v car adapter being included, slim chance I'd need it, but nice to have "just in case".

Tesoro's are notorious for tight battery compartments, and while these batteries are .025" thinner, and .010 longer than an alkaline, they fit the same.

I knew they came "ready to use", and checked voltage on 2 of the 4 batteries, 10.25 V.

So at least at this point, until I get to use then, totally happy with purchase. I might buy some AA's for the DeLeon and Fisher if I'm satisfied with the 9V's.

Got these from JZS Camera & Electronics, no affiliation (and mentioning since they're not sold by site sponsors). Found them on AMZ, but don't use AMZ, so went straight to their site. Same price same free shipping.

__________________
Tesoro: Vaquero, DeLeon, Cibola with GB mod, and Compadre (with coil swap and 3-D mods).
Fisher: 1265X
Before buying a Nokta Makro look at my thread:
https://metaldetectingforum.com/showthread.php?t=295281

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  #9  
Old 05-14-2022, 06:02 PM
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Well, after more reading, I'm just more confused

Looking into the rechargeable AA's, I don't want the 1.2v. Times 8 batteries, that's quite a drop. I did find NiZn's at 1.6v, but they claim they're for high draw uses (camera flash, lanterns, etc.), and I don't believe a detector fits that criteria.

I also read mixed reviews, as well as suppliers seem limited (amz).

So, unless someone can enlighten me, looks like I'll be sticking with the alkaline (single use) batteries for the DeLeon and 1265X. They don't see constant use, but I intend to increase it from hardly ever seeing daylight

__________________
Tesoro: Vaquero, DeLeon, Cibola with GB mod, and Compadre (with coil swap and 3-D mods).
Fisher: 1265X
Before buying a Nokta Makro look at my thread:
https://metaldetectingforum.com/showthread.php?t=295281

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  #10  
Old 05-14-2022, 09:01 PM
Jose159 Jose159 is offline
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Batteries can be very confusing... Premium nimh aa rechargeables are called 1.2 v but are actually 1.4 when fully charged. They drain evenly and are still working well at 1.25v. Lithium AAs are 1.8v but once they get below 1.6v they
fall fast and are shot. Alkalines are around 1.6v when new and once they get below 1.4v they are about done.

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  #11  
Old 05-14-2022, 09:51 PM
mh9162013 mh9162013 is offline
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Originally Posted by Gauntlet View post
Well, after more reading, I'm just more confused

Looking into the rechargeable AA's, I don't want the 1.2v. Times 8 batteries, that's quite a drop. I did find NiZn's at 1.6v, but they claim they're for high draw uses (camera flash, lanterns, etc.), and I don't believe a detector fits that criteria.

I also read mixed reviews, as well as suppliers seem limited (amz).

So, unless someone can enlighten me, looks like I'll be sticking with the alkaline (single use) batteries for the DeLeon and 1265X. They don't see constant use, but I intend to increase it from hardly ever seeing daylight
Most devices (metal detectors and others) that use 9V batteries can handle the higher voltages from a 9.6v (8 cell) nickel-based rechargeable 9V battery. For example, I use two 9.6v rated LSD NiMH batteries in my Fisher F2 and they both read well over 10volts per battery when fresh off the charger, but they work perfectly in the detector. The specific batteries I'm referring to are the Tenergy Centura batteries you can find on Amazon.com. Given how you want to use the batteries in rarely used devices, getting LSD batteries is a good idea (unless the devices have notable parasitic draw).

Unless the battery is regulated, the only way you're gonna get 9 volts from a 9V battery is if you use alkaline cells...that's just how the battery chemistries work (alkaline = 1.5 nominal volts per cell, NiMH/NiCd = 1.2 nominal volts per cell, lithium ion/poly = 3.6 or 3.7 nominal volts per cell, etc.).

If you're really worried about the higher voltage, there are 7 cell NiMH 9V rechargeable batteries out there. I think those are close to about 9.5 volts fresh off the charger, even though their nominal voltage is 8.4v.

Note, nominal volts per cell is basically "average" voltage during a typical discharge. As you've noticed, most rechargeable batteries will read much higher voltages when fresh off the charger. But, these higher voltages will start to drop over the next few hours and while under load.
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