On Mar 22, 6:51 pm, Pete Brown wrote: wrote: I have an old TPX 720 handheld radio. It was sitting for 20 + years and the rechargable batteries were shot. They are 1.2 v nicads, 10 of them. Before I go out and buy more, does anyone know if I can just put regular aa cells in it to see if it works? The nicads are 12 volts total, and the dry cells would be 15. I don't want to fry the radio.
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Thanks KurtAnother option would be to hook up 8 of the 1.5 volt dry cells (I knowRadio Shack makes an 8 cell holder), and make a little adapter to gofrom that pack to the radio wire harness.I have two Terra's that are in about the same condition. The previousowner seemed to think that the radios should be left on charge all thetime so they would be 'ready when you needed them.' Needless to say,those NiCads are dead to the world now.StevePeter Wyld23.03.08 4:11. I've used three TPX 720s over the years, panel mounted, starting in 1980with the first one in my Libelle, in 1984 the 2nd in my ASW 20 C, andnow 13 years with the 3rd in my ASH 26 E. It's a good radio, with cleartransmission and a sensitive receiver. I've run them all directly offthe 12 volt glider battery.To test it, you could try 9 AA batteries (about 13.5 volts) and shortthe last position in the battery holder. Or, remove the batteries, thentemporarily connect a 12 volt battery to the output leads from thebattery holder.
Make sure you get the polarity right.If the radio works satisfactorily, you can put in new ni-cads to make itportable again. If it doesn't, there are several good choices forhand-helds these days at bargain prices compared to what the TPX 720cost when it was new!-Eric Greenwell - Washington State, USA. Change 'netto' to 'net' to email me directly. Updated! 'Transponders in Sailplanes'.
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New Jan '08 - sections on Mode S, TPAS, ADS-B, Flarm, more. 'A Guide to Self-launching Sailplane Operation' [email protected] 9:19.
Tim is right about the corrosion. It is doubtful, but If the case isstill ok, you can get 'dummy' batteries from Radio Shack (at least youused to be able to - they don't seem to have the selection that theyused to) to convert to alkalines. The dummies are available at otherelectronics suppliers and probably most places that sell nicad or nimhcells. Basically, it is a plastic spacer with a conductor to bridgebetween the battery contacts on the case. Otherwise, it would be veryeasy to cobble something up from the old Terra battery case.
It willmost likely need to be rebuilt anyway due to the corrosion. I ran acouple of Terra's on alkalines, but the corrosion was too much of aheadache. I never got around to rebuilding the battery case.Ideally, now I would call up Batteries America (formerly Mr. Nicad) orsome other reputable battery shop to put together a battery pack thatwould fit in the Terra or just order cells with solder tabs and do itmyself.I have seen some 'nickel-alkaline' rechargeables that are supposed toretain charge much longer than nimh or nicads. They don't seem tohave the storage capacity of nimh but they are still quite a bit morethan the old nicads.
On Fri, 27 Mar 2015 10:27:25 -0700, richdugger wrote: Why not just use the cigarette lighter adapter???? RichSome older devices aren't happy being connected to external power withouta set of good batteries in them. I don't know if that radio is one ofthem.I'm currently reviving my 1976-vintage HP-25 calculator by adapting itsbattery holder to use AAA rechargeables mounted so they can be replaced:it used to use AA size NiCds with the lid glued on its battery holder.The originals were 550 mAh while the AAA cells I're replace them with are800 mAh so thi sis a win-win replacement.The HP-25 needs working rechargeable batteries installed to buffer it'sexternal PSU's output: run it up with either no batteries or dead onesinstalled and the display flickers violently.
If I temporarily fit a pairof AA alkalines it works as expected with a nice, steady display.-martin@ Martin Gregoriegregorie. Essex, UKorg Eric Greenwell28.03.15 21:13. I used three TPX 702s in three different gliders, runningoff the 12 volt battery in the glider. Three radios for a total 27 years.If you want it as a portable, see if you can find one of the factorybattery boxes that used AA cells (I may not be recalling this right),and how many it used. Alternatively, just put 9 AA cells into the nicadbox, for 13.5 volts.
That would be within the voltage range of 10 fullycharged nicads.-Eric Greenwell - Washington State, USA (change '.netto' to '.us' toemail me)- 'A Guide to Self-Launching Sailplane Operation'- 'Transponders in Sailplanes - Feb/2010' also ADS-B, PCAS, [email protected] 18:14. On Monday, January 29, 2018 at 9:14:51 PM UTC-5, wrote: Yes you can! But buy AA Nimh types 2500 mah each or 3000 mah get 10 just install like any battery case.The highest capacity cells often have the highest self-discharge and early failure rates.
I'm much happier with 2000 mAH low-self-discharge cells, such as Sanyo Eneloop. Especially for devices that are used occasionally, it's frustrating to pick it up when you need it and find the batteries went dead.Don't know whether you can get low-self-discharge NiMH cells with solder-able tabs though.Another battery type I've been experimenting with are AA-size 3V Lithium Iron Phosphate (LiFePO4).
Paired with dummy cells (since they are 3V each) they are a very lightweight and low-self-discharge alternative for occasionally-used devices such as headlamps, cameras, etc. As long as the device uses an even number of AAs.
These cells need a special charger, and I would charge them individually and not in a pack. Their capacity is lowish, too, about 600 mAH - similar to the capacity of NiCads, but at about 1/3 the weight.