9v battery terminal blanks?
in [Repair]
|
Prev: Viewsonic VG150 logic board 0171-2242-0153 3150-0122-0150 repair help
Next: Service manual or schematics for Kenwood KR-7600 reciver
From: Peter Hucker on 19 Dec 2008 15:31 On Thu, 18 Dec 2008 22:56:44 -0000, jakdedert <jakdedert(a)bellsouth.net> wrote: > Peter Hucker wrote: > > <snip> >> >> Then use the new type of NiMH, the pre-charged ones which don't lose power sat on the shelf. Take them out the packet and they are as good as alkalines. Only keep them for a fraction of their life if you want a nice long charge, and put them in a trickle charger when not in use. >> > > In a word; no. > > We don't have trickle chargers in the truck that takes them to the next > city; nor the time to monitor their health. A new Procell is a 'known' > resource. It always works, IME. It always lasts about the same amount > of time. When it's exhausted (actually long before) we discard it--or > switch it to less demanding tasks--and grab a new one (which will last > exactly as long as the last one did). I have a box of used ones right > across the room. Want some? They're great for kids toys, flashlights, > portable radios etc. > > You're not listening. Use them yourself if you want to. I value my job > and my reputation much higher than the price of a new battery...or a > thousand of them. What will you do when they stop making them? -- http://www.petersparrots.com http://www.insanevideoclips.com http://www.petersphotos.com I had amnesia once -- or twice.
From: Peter Hucker on 20 Dec 2008 14:23 On Fri, 19 Dec 2008 16:13:13 -0000, Ron Johnson <ron(a)lunevalleyaudio.com> wrote: > ian field wrote: >> "Ron Johnson" <ron(a)lunevalleyaudio.com> wrote in message >> news:nr2dnZHkN6rliNfUnZ2dnUVZ8sXinZ2d(a)bt.com... >>> jakdedert wrote: >>>> John E. wrote: >>>>>> ... 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. >> > > 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. 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. -- http://www.petersparrots.com http://www.insanevideoclips.com http://www.petersphotos.com A beautiful young girl is about to undergo a minor operation. She's laid on a trolley bed by a lady in a white dress and brought to the corridor. Before they enter the room she leaves her behind the theatre door to go in and check whether everything is ready. A young man wearing a white coat approaches, takes the sheet away and starts examining her naked body. He walks away and talks to another man in a white coat. The second man comes over and does the same examinations. When a third man starts examining her body so closely, she grows impatient and says: "All these examinations are fine and appreciated, but when are you going to start the operation?" The man in the white coat shrugged his shoulders: "I have no idea. We're just painting the corridor."
From: Peter Hucker on 20 Dec 2008 14:27 On Fri, 19 Dec 2008 06:44:03 -0000, Geoffrey S. Mendelson <gsm(a)mendelson.com> wrote: > BobW wrote: >> Do you have any info that indicates that they can't put out as much current >> and/or have higher internal resistance (over time) compared with alkalines? > > Sorry, I said two different things in the same paragraph and may have created > some confusion. > > First the slow self-discharge rechargable batteries have a higher internal > resistance and lower output current than the "regular" ones of the same > chemistry. > > Therefore "slow" NiMH batteries have a higher internal resistance, lower > output current and longer recharge times than regual NiMH batteries. Then how come I charge them in 15 minutes in a Uniross rapid charger? > "Slow" alkeline batteries have a higher internal resistance, lower > output current and longer recharge times than regular alkeline batteries. What are slow alkaline batteries? No alkalines self discharge, so why ake slow ones? > I mentioned the alkeline ones as their high internal resistance was a > deal killer for me. I could not use on HT's (handheld radios). They worked > fine with 1 watt output (low power), but on high power (3-4 watts), they > failed. > > Going back to the NiMH batteries, I can't say how well they will hold up > over time. I only use them on MP3 players that take a single AAA battery. > So far it has not been good, the first batch to almost 10 cycles to > have any usefull capacity. It may also have been my fault, because I > charged them with the included charger which needed 24 hours or more > to charge them. > > The second batch has been charged only with a higher current charger and > they seem fine. I once got a large batch of dud NiMHs. They were non-slow Uniross batteries. They functioned normally for about 3 weeks with a few charges, then started self discharging so rapidly I couldn't leave them on a shelf for 2 days! > Note that the players are low current devices, they discharge at about a > rate of 100ma or less. > > > >> I have been using the Hybrio hybrid batteries in a Canon SX100IS digital >> camera for about a year now and I haven't noticed anything problematic about >> them. They last a LONG time without any special conditioning. I use a Maha >> MH-C401FS charger (set to 'slow'). >> >> I've used alkalines in several different cameras and have had horrible >> results with them. > > All alkelines have a higher internal resistance, which is probably why you > have the problem with them. If you are a camera buff, that was one of the > two differences between the Canon T-90 and EOS-1. The T-90 used AA batteries, > the EOS used lithium. Canon was unable to get the current they needed for > all of the electronics in the camera from AA batteries. There are Lithium AAs. -- http://www.petersparrots.com http://www.insanevideoclips.com http://www.petersphotos.com When is it ok for a man to hug another man? A. If he's your father and at least one of you has a fatal disease. B. If you're performing the Heimlich maneuver. C. If you're a professional baseball player and a teammate hits a home run to win the World Series, you may hug him provided that: (1) He is legally within the base path (2) Both of you are wearing sufficient protection, and (3) You also pound him fraternally with your fist hard enough to cause fractures.
From: Michael A. Terrell on 20 Dec 2008 14:30 Peter Hucker wrote: > > Designing anything for alkalines only in ths day and age is absurd. Show us some of your designs, troll. -- http://improve-usenet.org/index.html aioe.org, Goggle Groups, and Web TV users must request to be white listed, or I will not see your messages. If you have broadband, your ISP may have a NNTP news server included in your account: http://www.usenettools.net/ISP.htm There are two kinds of people on this earth: The crazy, and the insane. The first sign of insanity is denying that you're crazy.
From: ian field on 20 Dec 2008 14:36
"Michael A. Terrell" <mike.terrell(a)earthlink.net> wrote in message news:e9CdnUM894RZ2tDUnZ2dnUVZ_j0AAAAA(a)earthlink.com... > > Peter Hucker wrote: >> >> Designing anything for alkalines only in ths day and age is absurd. > > > Show us some of your designs, troll. > BWAHAHAHAHAHAHA....... Ow - my sides hurt! |