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Old 12-28-2010, 07:12 PM   #1
George Hayes
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Default Rechargale Transmitter Batteries

I have a HKT4A-V2 Trans. I would like to know if there is Rechargable Batteries for it,and where can I get them. Geortge!!
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Old 12-28-2010, 07:31 PM   #2
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If it uses AA batteries, then you can use any standard rechargable AA battery. I do recommend Sanyo Eneloop batteries. They are about the best rechargable standard sized battery out there. Well worth the extra bit of money.
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Old 12-28-2010, 08:05 PM   #3
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+1 on the Eneloops.
Do NOT be lured by high milliamp NiMh (2500+). Most of them are crapl

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Old 12-28-2010, 08:47 PM   #4
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Originally Posted by flydiver View Post
+1 on the Eneloops.
Do NOT be lured by high milliamp NiMh (2500+). Most of them are crapl
Now that is rubbish statement ..... and I back that up by saying - read my post in Radio section about normal over-counter Grundig AA NiMH 2600mAH cells in my radios ........... near 13hrs run time ..... 2 - 3 weeks on shelf and still good ...

Eneloops are good - no question ... but to say "Do NOT be lured by high milliamp NiMh (2500+). Most of them are crapl" .... is ridiculous. There are many out there by well known names .... and economically priced ....

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Old 12-28-2010, 09:38 PM   #5
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I didn't say ALL of them, but a lot of them are. Once you get past 2500mA you have to be VERY selective about your choices. I speak from a LOT of time spend in CandlePowerForums where extensive tests have been done, and some unfortunate choices of my own. I stand by the statement.
When there is a VERY superior and easily obtained alternative that is highly suitable for a TX application why bother with dicey alternatives?

Grundig to my knowledge is not available in the US.

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Old 12-28-2010, 11:03 PM   #6
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Just Googling that transmitter, and I get no results except for a link back here and a few foreign ones, so I can't really say much more than check the documentation. It should say whether you can use NiMH rechargeables or not.

However, it's worth noting that ordinary AA cells (assuming it uses those) are rated at 1.5v per cell nominally, so 4 of these is 6v. If you use NiMHs, then it's 1.2v per cell nominal, so only 4.8v for 4. That 0.3v per cell soon makes a difference.

I don't know exactly how NiMHs are constructed, but I believe some of the higher-capacity ones can be dodgy because they use a thinner membrane inside the cell to get the required power density. Maybe going no higher than 2000mAh for NiMH cells may be expedient.
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Old 12-29-2010, 10:01 AM   #7
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Originally Posted by Angoid View Post
...............
However, it's worth noting that ordinary AA cells (assuming it uses those) are rated at 1.5v per cell nominally, so 4 of these is 6v. If you use NiMHs, then it's 1.2v per cell nominal, so only 4.8v for 4. That 0.3v per cell soon makes a difference.
.......
Can we dispel this myth once and for all ?

It is true that NO-LOAD voltages are different .... dry-cells at 1.5V, NiMH at 1.2V.

But that is where it ends.

Put both on load and you soon find out which can take the load ... Dry-cells often drop LOWER than 1.2V, while NiMH will maintain it's 1.2V or near as dam it to make no difference.

Replacing Dry-cells with NiMH is not a problem unless specifically stated by manufacturer - which really is an old hat matter ... It used to be that many items would have 7 cells if NiCD and 8 cells if Dry (alkaline) ...... if you broke open a NiCD pack in olden days - often #8 cell was a bridging dud ....

Second the discharge curve of a NiMH is near flat till immediately before it is flat out discharged. Unlike a dry-cell that voltage reduces as it discharges.

Therefore I suggest if you want maximum signal from your TX ... go NiMH ... as it will transmit at full power for longer than a Dry-cell set-up. Ok - the difference is theoretical rather than really effective.

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Old 12-29-2010, 10:06 AM   #8
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Originally Posted by flydiver View Post
I didn't say ALL of them, but a lot of them are. Once you get past 2500mA you have to be VERY selective about your choices. I speak from a LOT of time spend in CandlePowerForums where extensive tests have been done, and some unfortunate choices of my own. I stand by the statement.
When there is a VERY superior and easily obtained alternative that is highly suitable for a TX application why bother with dicey alternatives?

Grundig to my knowledge is not available in the US.
Fair do's ..... I accept that there are some real crap out there ... but you'll soon realise ... I usually trial any new brand in other gear like digi cameras etc. before committing models to them. I'm unlucky enough to have a HP Digi camera that EATS AA's .... I've never seen such a terrible machine before ... so that is my quick tester for AA's ... If it lasts a day in there, even switched off - it's good to go !! Seriously. The bad ones go in clocks and other non-critical items. So still saving money against dry-cells.

I also have indoor Co-Ax heli that takes 4 AA's in the Tx ... that's another good test bed ...

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Old 12-29-2010, 12:18 PM   #9
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Also, keep in mind that some of the higher-mah cells can appear fine initially, but after some use they develop a high self-dishcharge rate.

I've been using the Turnigy brand LSD cells they have at hobbyking, and they've been working fine. I've seen it suggested online that these are simply re-branded Ray-o-vac Hybrids, which are a fairly good AA NIMH. For the price, it's worthwhile buying some of the Turnigy cells to use up all of your allowed shipping weight on an order.

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Old 12-29-2010, 02:03 PM   #10
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There is the factor for me also that I live in Latvia and if I want anything at 'proper' price - I have to order online. There being only 2 shops in all Latvia - and both are in Riga - the capital and they order online as well. It's a 3 - 4 hour drive for me, I pay more and still have to wait usually as they have little stock. When you think that there are only a handful of RC flyers in the country - it's not a good business to have.

So that means I either wait for LiPo ... or buy over counter what is available. Luckily the Grundig NiMH's so far have proven to be good AA and AAA rechargeables and are in most shops here. At the price as well - I can afford to swap out often - so actual life-span is not a problem. But so far they are over 6 months old ... have had plenty charge cycles and still giving me good life ....

I repeat again so people don't misunderstand me - I am NOT against LiPo in Tx's ... I just do not consider the arguments presented are convincing enough to change from high capacity NiMH ... 2000mAH is same whatever battery type you have ...

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