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Re: AA NiMH batteries, input on brands

 

Hi Mike,
I've bought Tenergy Li-ion cells and measured their capacity to be close to the claimed capacity.? I've had reasonable success with EBL NiMh cells, but the AAAs I bought were far short of their capacity claims at medium discharge rates.? It's hard to dispute the NiMH capacity claims because the manufacturer does not associate a discharge rate with the claims, and the capacity is very dependent on the rate.? For Li-ion and LiFePO4, the capacity is not so rate-dependent.? I suggest you buy a set, measure the capacity, and return to seller if you find that the capacity is far short of the claim.
Cheers
Halden VE7UTS
Re: AA NiMH batteries, input on brands

 

Maha / Powerwerx - charging in a Maha charger.



--
Clint Bradford K6LCS
http//www.work-sat.com
Re: AA NiMH batteries, input on brands

 

¿ªÔÆÌåÓý

They were button top.



73,

Gary K9GS


-------- Original message --------
From: "Mike Owens/W5SKK via groups.io" <w5skk@...>
Date: 12/11/22 8:02 PM (GMT-06:00)
Subject: Re: [Yaesu-FT-60] AA NiMH batteries, input on brands

Gary,

Great to know!? Were the flat top style like the one in the link or the button top?

Re: AA NiMH batteries, input on brands

 

Gary,

Great to know!? Were the flat top style like the one in the link or the button top?
Re: AA NiMH batteries, input on brands

 

Dale,

Thanks for replying. I have ran across positive reviews and comments on the LADDA batteries, here and there.? Are you getting a good charge/discharge life from them??
Re: AA NiMH batteries, input on brands

 

John,

I would have to say Eneloop is the most recommended from the research I've done so far. ?

Thanks for commenting, it's much appreciated.

W5SKK
Re: AA NiMH batteries, input on brands

 

I've had such good service from Eneloop, that I've never tried anything else. Would be good to learn what other's have experienced from other brands.
73
KU8Q


On Sun, Dec 11, 2022 at 7:01 PM, Gary K9GS
<k9gs@...> wrote:
As a data point I've used this brand in AAA size and they work great in some pretty harsh conditions.



73,

Gary K9GS


-------- Original message --------
From: "Mike Owens/W5SKK via groups.io" <w5skk@...>
Date: 12/11/22 5:22 PM (GMT-06:00)
Subject: [Yaesu-FT-60] AA NiMH batteries, input on brands

Hello all,

I ran across some AA NiMH batteries made by Tenergy, I have never heard of the brand personally and was wondering if anyone here has used them before.? For the most part I have found positive reviews, still I'm curious.

Here is a link to the particular ones I found:



The price of these batteries are economical but most of the times you get what you pay for.

What brands of AA NiMH batteries has everyone here used with the FBA-25 battery case?? The good, the bad, the ugly. LOL

One more thing, I read some reviews on the Amazon Basics NiMH batteries where the purchaser peeled the Amazon branded sleeve off of the battery, to find that they were Panasonic branded batteries.? One reviewer did the same, to find that they were Samsung batteries.? I know it's common for companies to rebrand products for resale under their company name.? Again just curious if anyone here has read of this or has first hand knowledge.?
Quite a few reviews stated that the batteries tested and performed as well as Eneloops, and Powerx AA NiMH batteries.? Can anyone validate that claim?

Thanks in advance to everyone.

Mike Owens -- W5SKK

Re: AA NiMH batteries, input on brands

 

I have Ikea LADDA 1900mAh AA's in my FBA-25, these are basically Enerloops. I haven't tried the 2450mAh versions as I read somewhere they are too large and won't fit.
Re: AA NiMH batteries, input on brands

 

¿ªÔÆÌåÓý

As a data point I've used this brand in AAA size and they work great in some pretty harsh conditions.



73,

Gary K9GS


-------- Original message --------
From: "Mike Owens/W5SKK via groups.io" <w5skk@...>
Date: 12/11/22 5:22 PM (GMT-06:00)
Subject: [Yaesu-FT-60] AA NiMH batteries, input on brands

Hello all,

I ran across some AA NiMH batteries made by Tenergy, I have never heard of the brand personally and was wondering if anyone here has used them before.? For the most part I have found positive reviews, still I'm curious.

Here is a link to the particular ones I found:



The price of these batteries are economical but most of the times you get what you pay for.

What brands of AA NiMH batteries has everyone here used with the FBA-25 battery case?? The good, the bad, the ugly. LOL

One more thing, I read some reviews on the Amazon Basics NiMH batteries where the purchaser peeled the Amazon branded sleeve off of the battery, to find that they were Panasonic branded batteries.? One reviewer did the same, to find that they were Samsung batteries.? I know it's common for companies to rebrand products for resale under their company name.? Again just curious if anyone here has read of this or has first hand knowledge.?
Quite a few reviews stated that the batteries tested and performed as well as Eneloops, and Powerx AA NiMH batteries.? Can anyone validate that claim?

Thanks in advance to everyone.

Mike Owens -- W5SKK

AA NiMH batteries, input on brands

 

Hello all,

I ran across some AA NiMH batteries made by Tenergy, I have never heard of the brand personally and was wondering if anyone here has used them before.? For the most part I have found positive reviews, still I'm curious.

Here is a link to the particular ones I found:



The price of these batteries are economical but most of the times you get what you pay for.

What brands of AA NiMH batteries has everyone here used with the FBA-25 battery case?? The good, the bad, the ugly. LOL

One more thing, I read some reviews on the Amazon Basics NiMH batteries where the purchaser peeled the Amazon branded sleeve off of the battery, to find that they were Panasonic branded batteries.? One reviewer did the same, to find that they were Samsung batteries.? I know it's common for companies to rebrand products for resale under their company name.? Again just curious if anyone here has read of this or has first hand knowledge.?
Quite a few reviews stated that the batteries tested and performed as well as Eneloops, and Powerx AA NiMH batteries.? Can anyone validate that claim?

Thanks in advance to everyone.

Mike Owens -- W5SKK
Re: Battery FNB-83 Different voltage readings

 

Just did a fresh charge. Getting 8.6v @ the battery tab that go to radio & 7.9 on the charge tabs, looks like all is working well.

The battery was completely discharged yesterday, had been sitting for 8 months or so. I charged it yesterday to full & finally was able to discharge it today according to the charge icon flashing. Then recharge again. I think it needed a few charge/discharge cycles to function normally.

Maybe on that first charge yesterday there was a glitch to show the 3.75V

I just wanted to make sure it is operating as it should. A new Ham just past his tech test and wants to buy it from me, I got it and only used it a few times, can't hit any repeaters here, my elevation is too low.

Thank you again es 73
Gary KY8M
Re: Battery FNB-83 Different voltage readings

 

Looking at the rear of the FNB-83 there are 3 terminals, from the left going to the right they are as follows.

Positive (Through Diode) | Negative | Temperature sensor
If you measure using the Positive and Negative terminals you will see a voltage that is lower than what the radio displays due to the voltage drop through the diode. i.e. 7.75V, not 3.75V.
If you measure from the Temperature sensor which is 10K you will read an even lower voltage.

Ignoring what voltage the radio says, take the battery off the radio, measure across the Positive And Negative terminals on the back of the battery.?
Write down this voltage or remember it.

Flip the battery over and measure across the other terminals that connect to the radio. these are on the top of the battery pack, these terminals do not have a diode inline and are connected directly to the battery. You will see the actual voltage of the battery pack.?
Re: Battery FNB-83 Different voltage readings

 

Dave, I am getting a reading of 3.75v across the charging gold colored tabs, when battery display voltage is around 8v. On a full charge the reading are around 7.75v across the 3 charging tabs on the back of the radio. Diodes would account for this?
Re: Battery FNB-83 Different voltage readings

 

Because even diodes have some internal resistance.? Absolutely minimal forward and a total block in reverse.? But yes, the voltage drop through a diode is enough to give the difference shown on the battery pack.

Dave J.? ? AF0DJ.
Re: Battery FNB-83 Different voltage readings

 

I get the low voltages across both terminals.
Re: Can't get FT 60R to scan all 5 bands

 

Finally got it, went back to the manual. I had to:4. Press and hold in the [V/M(PRI)] key for one second to start scanning.

Thanks KY8M
Re: Battery FNB-83 Different voltage readings

 

One of the terminals is temperature sensor. Possibly 10K so you will get a very low voltage reading if you measure across that terminal.


On Sat, 10 Dec 2022, 20:29 dcx3420 via , <dcx3420=[email protected]> wrote:
Well, When the battery voltage drops to 8v on the display & I check the voltage via the 3 gold colored charging tabs I am getting about 3.75v from the the left tab to far right tab & the on the tab to the left of it. At 8,6v on the display as I stated the voltages on the charging tabs are 7.49v. Is there a switching diode that cause this. I am thinking the when it is charging it is charging the two cells in series. When the voltage drops to 8v I am reading the 3.75 as parallel.

I hope I am explaining myself to where I am able to make mt point understandable.

Can anyone confirm this with doing a few voltage checks.. I have the US model without the "E"?

Re: Battery FNB-83 Different voltage readings

 
Edited

Well, now when the battery voltage drops to 8v on the display & I check the voltage via the 3 gold colored charging tabs I am getting about 3.75v from the the left tab to far right tab & the on the tab to the left of it. At 8,6v on the display as I stated the voltages on the charging tabs are 7.49v. Is there a switching diode that cause this. I am thinking the when it is charging it is charging the two cells in series. When the voltage drops to 8v I am reading the 3.75 as parallel.

I hope I am explaining myself to where I am able to make mt point understandable.

Can anyone confirm this with doing a few voltage checks.. I have the US model without the "E"
Re: Battery FNB-83 Different voltage readings

 

Hi Clint,

It was me who said the voltage drop is due to the diode inside the battery pack.

All semiconductors have a voltage drop.
A standard silicon diode is around 0.7V but can vary slightly.
Re: Battery FNB-83 Different voltage readings

 

¿ªÔÆÌåÓý

Diodes allow current flow when forward biased and stop current flow when reverse biased.? However, there is always a voltage drop when forward biased caused by the potential difference at the p/n junction.? That difference must be overcome to allow correct to flow.? Fo silicone diodes the difference in potential is approximately 0.7V.? If you measure the voltage across a diode not connected to a circuit you'll see that voltage in the forward direction.? That causes you voltage reading of the battery to be about 0.7V less when measured through the diode than when measured across the terminal that do not have a diode present.

73 de AC7EW
Kelly

From: [email protected] <[email protected]> on behalf of Clint Bradford via groups.io <clintbradford@...>
Sent: Saturday, December 10, 2022 11:17:13 AM
To: [email protected] <[email protected]>
Subject: Re: [Yaesu-FT-60] Battery FNB-83 Different voltage readings
?
Diodes are not resistors. Someone stated that the voltage drop in this scenario was caused by a diode. Diodes do not block - they allow current in one direction. Why would a diode cause this voltage drop?
--
Clint Bradford K6LCS
http//www.work-sat.com

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