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Re: 9v battery terminal blanks?

>>> ... and I never ever use rechargables in radio packs.

>>>> ROn(UK) >>> >>> Why? [if you wouldn't mind a newbie question...] >> >> See my multiple posts on the subject. For most presentation purposes, >> the proven reliability of the good old alkaline--fresh out of the box--is >> superior. One less thing to worry about in a complex and demanding >> environment. >> >> The cost of having a show 'go down' is much more than that of fresh >> cells...especially if the cost is losing your job. >> > > What he said. The risk just isn't worth it for the price of a few > batteries. > There`s also the factor that some low end radio mikes seem to object to > rechargable batteries (certainly nicads) It`s possibly the batteries > internal resistance changing as it discharges. > I`ve not really studied it, but when the rechargable discharges beyond a > certain point, the transmitters agc seems to get screwed up and unstable, > feedback is the result. Maybe someone with more technical understanding > can explain. > > Ron(UK)

You don't need much technical understanding to know that NiCd & NiMh batteries have a lower terminal voltage.

Reply to
ian field
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It`s not to do with the terminal voltage, it`s something to do with the batteries internal resistance. Wireless packs are designed for replacable batteries. The internal battery metering is calibrated for Alkalines.

Remember the OP was talking 9v (PP3) batteries here, You're asking for trouble using anything other than Procells or Energisers.

Ron

Reply to
Ron Johnson

Designing anything for alkalines only in ths day and age is absurd.

P.S. rechargeables have LESS internal resistance. Try shorting a rechargeable and see how hot it gets.

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Reply to
Peter Hucker

Show us some of your designs, troll.

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Reply to
Michael A. Terrell

BWAHAHAHAHAHAHA.......

Ow - my sides hurt!

Reply to
ian field

I forgot: A frozen parrot on a stick doesn't count.

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Reply to
Michael A. Terrell

In your opinion maybe. Professionals in the sound industry use quality replaceable batteries, they are reliable - reliability means _everything_ when a show (or your job) is at stake.

and see how hot it gets.

Try shorting a 9 volt Procell! stand well back tho...

Ron

Reply to
Ron(UK)

"Ron(UK)" wrote in news: snipped-for-privacy@bt.com:

Lame. I keep hearing this silly excuse. This is consumer high-street shop level thinking. The whole audio industry is riddled with it. For decades dull black boxes have been shifted with the letters PRO on them, regardless of how tacky they are, never has an industry blown its trumpet so loudly.

Do they use alkalines in space? In oil drilling gear that has to go down deep in the earth and stand vibrations? In pacemakers? In aircraft black boxes? Ok, maybe they do, sometimes, but there are lot of battery technologies reached for when mission critical reliability is needed, and I bet most industries don't reach for alkalines. Oil wells reach for lithium thionyl chloride, for example. If long life primaries with extreme reliability are important to people who are so up themselves with their 'reputation' and their expensive hours that are worth SO many batteries, why not buy those?

Instead of clinging to one aging method that is highly polluting, use some imagination and explore what REAL professionals with mission critical requirements are up to. Compared to those, the industry that makes such a song and dance of putting microphones in front of delegates at conferences is like the hairdressers and telephone sanitisers that Douglas Adams whimsically crashlanded on some planet along with a captain with a penchant for bathtubs and rubber ducks. >:) While we need entertainment and communication to make life worth living, people used to get by till very recently without having to use so many mics to feel important or get themselves heard.

Get a grip. This thread has wound its way round this silly circle for too long, and I should never have got into it myself, but I have, and this is my parting shot. I'll read the flames if I have the patience, but I will try not to get further involved.

I admit to using a few alkalines at times, but either where laziness is more attractive than performance, or where nothing else fits yet. If I could change all to Li-ion or lithium thionyl chloride types, I would. Specifically, the only time I justify an alkaline is when I need a PP3 that is ready to use, between long periods of disuse. For anything else, I find another way.

Reply to
Lostgallifreyan

rechargeable and see how hot it gets.

John W. measured something like 90A from a shorted rechargeable (NiCd, IIRC) 9V battery. Enough to cause a real explosion.

Best regards, Spehro Pefhany

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Reply to
Spehro Pefhany

rechargeable and see how hot it gets.

I used to have a badly damaged wireless mic that caught fire while in use. If it hadn't been in a thick leather case the user would have had third degree burns where the ni-cads failed. He got some first & second degree burns as it was. The inside of the leather case was soaked with the contents of the vented cells, which would have caused more damage. The brand & model information was burnt off, along with most of the circuitry. The man using it reportedly grabbed it from his chest & threw it across the room before it could do more damage. When they showed it to me they didn't know who made it, and the dealer they bought it from was out of business.

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Reply to
Michael A. Terrell

rechargeable and see how hot it gets.

Duracell quote PP3 9v internal resistance as 1.7ohm, which makes the Short circuit current 5.29 Amps - not nearly as much as a NiCd!

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Reply to
Peter Hucker

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