[time-nuts] HP-105B Battery Replacement?

[Mark Spencer]

Thanks I was  aware of Ni Fe batteries but have never seen them for sale at the local "battery store" where I buy batteries for my vehicles, time nuts and amateur radio pursuits (:

I view lead acid batteries (especially ones designed for in door use) as semi expendable for my various hobbies.    I figure I got my monies worth from the ones backing up the HP105B and FTS 1050 as I am well on my way to 10 years of up time for those two devices. 

I tend to replace  batteries on general principles every 5 years or so or at least move them to a less demanding application.   (Ie. shuffle them from time nuts backup use to portable power use for amateur radio.)

Sent from my iPhone

> On Sep 15, 2016, at 3:13 PM, Alexander Pummer <alexpcs at ieee.org> wrote:
> 
> if you deep discharge led acid batteries -- which are not made special for deep discharge -- you will have to replace them quite often, on the other hand Ni-Fe batteries you could short out, overcharge they are undisrtuktable that is the reason why they are not produced any more in the US, they do not fit into the American business-model, but phone companies, railway and aviation still using them, you could still find old electrical forklifts with Ni-Fe battery made by Edison Batteries in the sixties in the past century the batteries are still fine. Tudor -- a led-acid battery producer -- purchased Edison Batteries and closed down the formidable competitor
> 
> 73
> KL6UHN
> Alex
> 
>> On 9/15/2016 2:26 PM, Mark Spencer wrote:
>> Hi I've run my HP105B (with the old style oscillator) from AC power via a consumer grade UPS, 24 Vdc from a lead acid battery bank and briefly from the internal battery pack with out any notable changes in performance (that being said I can't measure phase noise so this observation may or may not be of use.)
>> 
>> I'm not to fussed over the internal Nicad pack and rely on an external battery bank in case I loose AC power for an extended time period.
>> 
>> During a two day outage my HP105B and FTS1050 ran nicely from a 100 AH battery bank but the batteries needed to be replaced shortly afterwards.
>> 
>> Sent from my iPhone
>> 
>>> On Sep 15, 2016, at 11:13 AM, Jeremy Nichols <jn6wfo at gmail.com> wrote:
>>> 
>>> Your point is well made. My question is: what happens to the quality of the output sine wave if I use anything other than a true sine-wave (i.e., expensive) UPS? Most of them these days produce a semi-sine wave (aka modified square wave) that may or may not play well with the 105B. Anyone have experience?
>>> 
>>> A external battery and appropriate chargers and cabling does sound like another good alternative. Harder to move around but I don't (yet) have such a need, only that the 105B stay "on" regardless of power failures.
>>> 
>>> Jeremy
>>> 
>>> 
>>>> On 9/15/2016 10:15 AM, Bob Camp wrote:
>>>> Hi
>>>> 
>>>> A bigger question becomes:
>>>> 
>>>> Do batteries inside equipment make much sense anymore?
>>>> 
>>>> These days, a UPS is often a standard part of a rack in an outage prone area. Powering
>>>> the “whatever” instrument off of the same UPS as the rest of the stuff is one obvious
>>>> answer.
>>>> 
>>>> The other answer is an even older approach. Use a battery bank that is external to all
>>>> the gear in the rack and tend it independently of each box in the rack. That way you have
>>>> a few very large cells to worry about rather than a whole bunch scattered about. Things like
>>>> lead acid that are impractical in a piece of gear are more of an option in an independent
>>>> battery box. A single charger / line supply makes it easier to invest in something with real
>>>> smarts in it. The advent of dirt cheap isolated switchers makes the conversion to instrument
>>>> voltages a lot easier than it once was. Pick a common voltage like 12, 24, or 48V and run with it.
>>>> 
>>>> My answer to the frequency standard battery pack question has become “don’t do it”. It makes
>>>> them a *lot* lighter weight !!!
>>>> 
>>>> Bob
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