Myron Beaumont Posted November 30, 2007 Share Posted November 30, 2007 I keep my tiny one I hardly ever use in a safe place -& its not a buiscuit tin Quote Link to comment Share on other sites More sharing options...
Myron Beaumont Posted November 30, 2007 Share Posted November 30, 2007 DougIt appears that to" maintain" them over their (apparently) short life span you should cross your fingers and hope that someone will come up with a better answer than one of the many fail safe chargers that appear as being the answer to any problems you WILL inevitably encounter ad-infinitum. In the meantime I reckon a metal buiscuit tin is the way to go BUT check out your home insurance policy as well !My proper fuel is stored as per health & safety (thats another boring story though) Quote Link to comment Share on other sites More sharing options...
John Sheehy Posted November 30, 2007 Share Posted November 30, 2007 A car starter motor can draw up to 200amps and that is a big difference. However we are talking about a low demand electronic item so I think there is no comparison. The only Tx I have that accepts dry cells just has a red and green area to show voltage so I can't give the voltage onder load. My Tx manual gives voltage as 9.6v Ni-Cd or 12v alkaline and the current drain as 250mA so I think the comparison is just nitpicking. If you find the figures alarming then by all means carry on recharging your cells every time you fly (I had 2 2000mA Nimh's and still had to be careful).Incidently, My car battery reads 14v+ when fully charged (Idon't know if that supports my case or yours). Quote Link to comment Share on other sites More sharing options...
Ultymate Posted November 30, 2007 Share Posted November 30, 2007 Myron a car battery that drops to 8.5 volts whilst cranking the starter be it diesel or petrol, and yes there is a different tolerence for the two types of engine, is knackered assuming that all connections in the relevant circuit are in good order. Why quote figures you know are wrong? and whats more have no relevance to the lipo issue, there are loads of people who've been using lipos or lithium ions for a couple of years or more now with no problems. Quote Link to comment Share on other sites More sharing options...
John Sheehy Posted November 30, 2007 Share Posted November 30, 2007 Yes Steve, a pyrex dish does sound more sensible, I'll check out the kitchen cupboards in a few weeks when I next charge my Tx LiPo. Quote Link to comment Share on other sites More sharing options...
Steve Hargreaves - Moderator Posted November 30, 2007 Share Posted November 30, 2007 John...safer to buy your own....an exploding wife is far messier than an exploding Lipo & costs more to remedy (flowers, chocolates, meal out...etc etc!!) Matalan or Tescos do some good ones & at low, low prices....Every Little Helps!!!!! Quote Link to comment Share on other sites More sharing options...
Myron Beaumont Posted November 30, 2007 Share Posted November 30, 2007 SORRY Y'all I was just trying to put things in perspective - never mind the exact voltages/loads etc . I'm glad that one or two or more are happy with Lipos but you must consider that my scepticism is only based on what i've read about on this very forum & am happy with what I have got used to and know about from my own experience Isn't that what this hobby is all a bout .Yes I want to use the best that there is available but as I said I'm a little bit sceptical & I know for a fact I'm not the only one Incidentally for the new- comers on site I wasn't born yesterday & have spent all my life involved in engineering and offshoots of/ & musician & real boat builder & one of the first people in Cornwall to build his own hang glider & fly it off Perranporth & be 2nd engineer running an oil rig which happened to involve quite a bit of electronics "know how" as well If you want to talk about specific subjects ie batteries in better detail Please feel free to do so but be careful 'cos Timbo & I know quite a bit Quote Link to comment Share on other sites More sharing options...
John Sheehy Posted November 30, 2007 Share Posted November 30, 2007 Myron,Keep posting your scepticisms, it's the varying opinions that makes this forum so interesting. Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted November 30, 2007 Share Posted November 30, 2007 Myron. You do not need to "feel sorry for me" because I have not, as you put it "got many converts"I am not running a sect. I do not work for the lithium battery industry. I have absolutely nothing to gain personally from others using Lithium batteries, other than perhaps the small benefit derived from mass useage driving down the prices. I am very happy using LiPos in all my equipment, airborne power, airborne R/C, and transmitters. As stated the voltage difference ( on or off load as the current draw by the average transmitter is only around 150m/a ) between a good condition 8 cell NiMH and a 3s LiPo is very small, and I am quite sure the power regulating system in the tr is quite capable of handling it, and has done so for almost 6 months now in my case. Quote Link to comment Share on other sites More sharing options...
G Posted November 30, 2007 Share Posted November 30, 2007 I'm surprised to see people worrying about half a volt difference between battery types because equipment just isn't that voltage sensitive. Look at how chargers are perfectly happy with anything between 11 and 15 volts - and that's for the fussiest chargers. Equipment has to be voltage insensitive because battery voltage varies so much depending on its state of charge. 12V toys and appliances are always designed to cope with at least 13.6V because some alkaline dry cells can be up to 1.7V when very fresh (ie 13.6V for a nominally 12V set). I bet you could happily run a transmitter at 15 volts. However, I can understand that people are being extremely cautious given the high cost of transmitters - not to mention all the programming store in them - I sure as h*ll wouldn't want to fry mine! Quote Link to comment Share on other sites More sharing options...
Danny Fenton Posted December 1, 2007 Author Share Posted December 1, 2007 It may be worth people reading the very first post I put on this thread. I contacted the engineers at JR for their thoughts and they checked the voltage capability of the power supply and RF stages and they are rated far in excess of these voltages.Danny Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted December 1, 2007 Share Posted December 1, 2007 Yes Danny good point Quote Link to comment Share on other sites More sharing options...
G Posted December 1, 2007 Share Posted December 1, 2007 Isn't that amazing? One component in the transmitter is rated to take 35 Volts and the other 20 Volts - and that's what they're rated to - component ratings are conservative of course. Quote Link to comment Share on other sites More sharing options...
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