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From: Bob La Londe <none@none.com99>
Newsgroups: rec.crafts.metalworking
Subject: Re: Got 4Ah, not 5Ah, battery 18V (20V) - done right thing?
Date: Sun, 19 May 2024 12:28:00 -0700
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On 5/18/2024 7:33 PM, Jim Wilkins wrote:
> "Bob La Londe"  wrote in message news:v2b0j1$2u9ft$1@dont-email.me...
> 
> On 5/17/2024 5:56 PM, Jim Wilkins wrote:
>> ...
> 
>> I have a bit more experience with marine deep cycle lead acid 
>> batteries, and I don't think its as big of a deal as you think. ...
>> Bob La Londe
> 
> I post what I've seen at reliable sources, it's as cautious as the 
> battery manufacturers choose to be.
> 
> Personally I test batteries by loading them down with a carbon pile 
> until they scream for mercy, and rarely mention the results because they 
> vary so widely. I tested stuff to and beyond its limits professionally 
> and have acquired or built the gear to find those limits at home. I 
> don't blow up batteries any more but I have tested circuit breakers to 
> destruction.
> 
> UL "safety" testing is -dangerous-, much smoke and flame. The old 
> theatre curtain recipe of dipping cotton cloth in a solution of alum and 
> borax really does let it pass the vertical burning test.
> https://elteklabs.com/test-capabilities/material-tests/flame-fire-hazard/
> 

I never was employed doing destructive testing, but I did spend a decade 
or two doing low voltage communication contracting.  I learned there is 
what they say, and there is what there is.  Usually what they say fell 
short in my field, but sometimes it didn't.

When they say an IR motion sensor will detect motion at 90 feet they 
mean if ambient is below 70F and the subject is large and is running a 
fever.  LOL.  They don't say if ambient is 90+ its virtually worthless.

Seriously there are thousands of bass boats that don't have room for 4 
big deep cycles batteries running just three in series for the 36V TM 
and tapping the positive of the ground battery for nominal 12V for 
cranking and accessories.  The big thing is to charge as soon as they 
cool down (or get back to the hotel), and to have three equal batteries.

With most pros running 20-23 foot glitter barges these days most have 
plenty of room in the back for batteries, but some older boats and/or 
smaller boats didn't.  Many have also switched over to a single high 
voltage lithium for their TM battery for motors upto 48V.  I wonder how 
they do on the Potomac in a winter tournament before sunrise when the 
water gels on the line and freezes in the reel.  The lead acid deep 
cycles would work.  Something has to keep the lithiums from dropping to 
ambient temperature.

Anyway, this is all tangent of tangent now.


-- 
Bob La Londe
CNC Molds N Stuff


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