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-----Original Message-----
From: FT817@... <FT817@...>
Sent: Sunday, 30 June 2019 10:33 PM
To: FT817@...
Subject: RE: [FT817] ZIPPY Flightmax 8400mAh 4S2P 30C LiFePo4 battery

I should have not replied immediately - Matt covered it as well as I could!

Hey Matt - great mines or what?????

Vy73 - Mike - KD5KC.
El Paso, Texas - DM61rt.
SOTA W5T-Texas Association Manager.
NA-SOTA info is at:



-----Original Message-----
From: FT817@... <FT817@...>
Sent: Saturday, June 29, 2019 21:07 PM
To: FT817@...
Subject: RE: [FT817] ZIPPY Flightmax 8400mAh 4S2P 30C LiFePo4 battery

Hi Joseph, agree that a 4S LiPo is not suitable for the FT-817 (or any other 12V nominal radio without a buck converter or similar), however he is looking at a LiFePO4 not a LiPo – the voltage range of the 4S LiFePO4 is fine for the FT-817, although the better option is the 3S LiFePO4 which has a more suitable voltage range for the FT-817 than the 4S LiFePO4 batteries.



Tom, I bought three of the 8400mAh 4s2P LiFePO4 “zippy” batteries about 7 years ago. Still going fine, but I use them for radios that need to be around 13.8V (which the 817 does not – it works fine down to 8V or a little lower). I last saw them on the hobbyking site about 12 months ago when I was shopping for some of the 4S 4200 mAh LiFePO4) – they were hard to find, but I did find them in the end. Just looked now and couldn’t find them on hobbyking, so possible that they no longer sell them – perhaps an email to ask if they still sell them? As above, would recommend the 3S LiFePO4 batteries over the 4S – noticed that the US warehouse is currently out of stock for the 4200mAh 3S1P LiFePO4 batteries, but if they are like the VK warehouse, they will restock in a week or two. Alternatively I like the 3S LiPo 2500mAh batteries for the FT-817 – suitable voltage range, cheap, very lightweight and lasts for multiple activations.





Matt

VK1MA



From: FT817@... <FT817@...>
Sent: Sunday, 30 June 2019 12:42 PM
To: FT817@...
Subject: Re: [FT817] ZIPPY Flightmax 8400mAh 4S2P 30C LiFePo4 battery








I would not recommend running the 817 on any 4s lipo.. Although I have done it, they charge out to over 16 volts DC. Just out of curiosity, why the zippy flightmax? You can run any 3s lipo or lifepo safely. Hobbyking have the Turnigy series batteries in which I have used for many years. The current rating on them are conservative. I currently am using 4x Turnigy 20-30c 5000mAh 3s LiPo batteries for my portable pack. This 4 pack will run my Ft-991a at 100 watts for a good while in a pinch and they never get hot.





Joseph V.

KD4RXP

Iowa



On Sat, Jun 29, 2019, 20:18 tdgsr@... <mailto:tdgsr@...> [FT817] <FT817@... <mailto:FT817@...> > wrote:



Good Morning Group:



I've been searching for the battery above, without much success.



From what I can gather, the particular Zippy is a one-off.



Every dealer that I've visited was out of stock, including what I believe is the master distributor "Hobby King"



If anyone knows where one is lurking, or can suggest something comparable, I would appreciate a heads-up.



tnx es 73 de K3SSB



Tom G, Sr.














[Non-text portions of this message have been removed]



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Posted by: "Matt" <doormatt@...>
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And for a great FAQ ( Frequently Asked Questions ) see
Some really good technical info at: .
Please note that your messages and files sent to this group may appear anywhere on the Internet or in print without notice or compensation.
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Posted by: "Mike Olbrisch" <Mike-2020@...>
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And for a great FAQ ( Frequently Asked Questions ) see
Some really good technical info at: .
Please note that your messages and files sent to this group may appear anywhere on the Internet or in print without notice or compensation.
------------------------------------

Yahoo Groups Links