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| Thread ID: 141412 | 2015-12-14 04:01:00 | About new Dick Smith AA batteries leaking.................... | Billy T (70) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 1412844 | 2015-12-15 23:41:00 | bk T. I live in the UK and was not just referring to batteries but to the many products I have dealt with in my long experience in the electronics industry. Production 'quality control' seems to be a rare thing in the cases I have encountered. I personally would not buy anything knowingly made in China. |
blanco (11336) | ||
| 1412845 | 2015-12-16 02:09:00 | I know, but not sure BillyT wants to spend that kind of money on 24 of them at once! $15 a pair from Countdown is $180 for 24. Does he use the power supply enough to warrant spending that money? Are the batteries going to expire before they get much use? What Agent said................Bang on! :thumbs: At any particular point in time I would have upwards of 50 AA cells dedicated solely to instrument operations and my two battery packs, which would be a minimum of $375 invested, but wait, there's more! The next hit would be the number of chargers required (I bet nobody thought of that!) :waughh: When one of my power packs goes flat, I can 'recharge' it in five minutes or less: Captain Varta to the rescue! :nerd: Cheers Billy 8-{) As the Bishop said to the Actress: "It is extremely embarrassing when you have an unexpected equipment failure." |
Billy T (70) | ||
| 1412846 | 2015-12-16 02:34:00 | Yep, I'm sure the choice was resolved at the start of the thread anyway. The rest has just been suggestions and discussion. As I mentioned earlier you would need to add 6 cells and bring it to 30 per pack for the rechargeable AA's to reach the same voltage, with 24 you would be starting at about the voltage level you said it worked down to. With 1-2 cells the difference is not too important, but for your case it is. I have a charger from Jaycar that does 10 cells at a time, you'd need 3 of those and 60+ batteries, I can see why you wouldn't want to spend that kind of money. It works out at $621 from Jaycar for 3 chargers and 60 batteries as opposed to ~ 50c each for the Vartas from bunnings. It really depends how often you end up buying them., that's the equivalent of 41 packs of Varta batteries or 1230 individuals to break even. The gel cell option actually works out much cheaper, and you could build a 45V charger (approx float voltage) to charge all 3 at once, but these are just musings rather than a serious suggestion. 30 x 1.2V = 36V = 24 x 1.5V obviously |
dugimodo (138) | ||
| 1412847 | 2015-12-16 02:47:00 | bk T. I live in the UK and was not just referring to batteries but to the many products I have dealt with in my long experience in the electronics industry. Production 'quality control' seems to be a rare thing in the cases I have encountered. I personally would not buy anything knowingly made in China. Obviously, I am not referring to batteries only; but applies to any other product; and not restricted to NZ, too. Generally, I have no problems with China made products, as long as you steer away from those cheap stuff. What you pay is what you get! I have every confidence in China made products, as long as you steer away from super cheap stuff, which I think applies to products from any other countries - just bear this in mind: what you pay is what you get. " I personally would not buy anything knowingly made in China" - hard luck for you -- but, then, what is not "Made in China"? I can't imagine what's life like without 'Made in China' products! |
bk T (215) | ||
| 1412848 | 2015-12-16 05:43:00 | Obviously, I am not referring to batteries only; but applies to any other product; and not restricted to NZ, too. Generally, I have no problems with China made products, as long as you steer away from those cheap stuff. What you pay is what you get! I have every confidence in China made products, as long as you steer away from super cheap stuff, which I think applies to products from any other countries - just bear this in mind: what you pay is what you get. " I personally would not buy anything knowingly made in China " - hard luck for you -- but, then, what is not " Made in China " ? I can't imagine what's life like without 'Made in China' products! Anything made in Taiwan or Korea? |
gary67 (56) | ||
| 1412849 | 2015-12-16 09:59:00 | The gel cell option actually works out much cheaper, and you could build a 45V charger (approx float voltage) to charge all 3 at once, but these are just musings rather than a serious suggestion. 30 x 1.2V = 36V = 24 x 1.5V obviously The problems with SLA/Gel cells are their bulk, weight, high self-discharge rate, and the attention they need to keep them in good order. My 24 & 36 volt supplies are only rarely used, which is why I use light and less bulky 'always ready to go' dry cells. The rest of my AA/AAA usage is in 2's, 3's and 4's, with the occasional 6-pack for 9 volts. Incidentally, you can drag a lot of amps out of AA cells, I've seen single cells put out 5+ amps into a low-ohm load and when set up as a 6 or 12 volt battery you can pull a bit more (for a very short period of time). They can have an internal resistance as measured with an ESR meter (equivalent series resistance) as low as 0.06 ohms (Varta), and 0.07 (Panasonic), also checked were (Endeavour) 0.17, (Eclipse) 0.13, and surprisingly DSE came in at 0.08 when new stock. I have only two instruments that use SLA batteries and they are very rarely used. They are Swedish, substantial in size, but limited in functions, so I drag them out only as a last resort when I need to convince/impress a sceptical client. Last usage was to demonstrate that an 'active neutral field generator' could indeed create, for the more accurate use of an electron microscope, an oasis of zero alternating electro-magnetic fields in all three axis. I set up the instrument with the neutral field generator off, and my meter was reading a field strength greater than the specified limits for their electron microscope application in all three axis, then we turned on the generator and all three field axis dropped to zero, something I wouldn't in my wildest dreams have thought possible before I heard of this technology. Cheers Billy 8-{) |
Billy T (70) | ||
| 1412850 | 2015-12-16 10:47:00 | bk T. Quote: "just bear this in mind: what you pay is what you get." Not true. What about the many FAKE products that have flooded global markets for many years, including batteries? There are many examples of this to be seen online. Here is one: www.youtube.com |
blanco (11336) | ||
| 1412851 | 2015-12-16 19:43:00 | Well, there are some odd cases, of course. No one can force you to accept "what you pay is what you get". let be it. :) |
bk T (215) | ||
| 1412852 | 2015-12-16 19:51:00 | bk T. Quote: "just bear this in mind: what you pay is what you get." Not true. What about the many FAKE products that have flooded global markets for many years, including batteries? There are many examples of this to be seen online. Here is one: www.youtube.com Put a genuine battery on a hot plate and I suspect it might just go bang too :punk |
Renegade (16270) | ||
| 1412853 | 2015-12-21 07:17:00 | Put a genuine battery on a hot plate and I suspect it might just go bang too :punk So would you, but the issue with lithium batteries in particular is that they heat from the inside out, not outside in. They can be volatile little buggers. Cheers Billy 8-{) :horrified |
Billy T (70) | ||
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