[Elmers] Elmers Digest, Vol 20, Issue 2

[Greg De Hoogh]

I'd go with the silicon diodes in series, too. It's the simplest 
approach. They'll drop about 0.7V each, and aren't very expensive. Bear 
in mind that they'll dissipate some heat (about 35W each at 50A), so 
they'll need a heatsink.

Greg, N6PM

On 11/13/2020 6:53 PM, Bill-K6ACJ via Elmers wrote:
> Modifying the battery to remove a cell will screw up the battery management system and would be a huge fire hazard if it was shorted while performing a modification.
>
> Put one , two or three high currant silicon diodes in series with the battery output, each silicon diode has a voltage drop, diodes in series add, so its very easy to take the voltage down and much easier than a battery modification.   Old 2n3055 power transistors are cheap and perform a similar function when correctly wired.
>
> 2nd option is to sell it .
>
> Bill Prats k6acj
>
> Sent from my iPad
>
>> On Nov 13, 2020, at 12:00 PM, elmers-request at soara.org wrote:
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>> Today's Topics:
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>>    1. 12v Lithium Ion Battery Pack (Mitchell Skurnik)
>>
>>
>> ----------------------------------------------------------------------
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>> Message: 1
>> Date: Fri, 13 Nov 2020 05:43:13 +0000
>> From: Mitchell Skurnik <mskurnik at outlook.com>
>> To: "elmers at soara.org" <elmers at soara.org>
>> Subject: [Elmers] 12v Lithium Ion Battery Pack
>> Message-ID:
>>     <BY5PR19MB31593B434FA0A67D041AB7FFCEE60 at BY5PR19MB3159.namprd19.prod.outlook.com>
>>     
>> Content-Type: text/plain; charset="us-ascii"
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>> Elmers:
>> I bought a 100Ah battery pack from Ali Express and I mistakenly purchased the 14.8v version which has a nominal voltage of 10-16.8v.  That means that I cannot use it for radio operation as it would be out of the 13.8 +/- 15% voltage range that all radios I have seem to operate within.  It would be about 0.20V to 1.00V higher that what is within spec of the radios.  My question is, is there anyone willing to help me modify the pack to have a max voltage of 15.88 volts.
>>
>>
>> Mitchell J Skurnik
>> KN6FOA
>>
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>> End of Elmers Digest, Vol 20, Issue 2
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