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converting from Nicad to lipo reciever

whats required to use lipo for my Rx

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Dan Murphy12/02/2017 15:35:08
2 forum posts

hi guys. im just buidling a new RTF tucano 5 foot span aeroplane. i want to use lipo now . I intend to use a 7.4v 1000mah lipo to power the Rx.. can any of you guys tell me what i need to buy.i.e regulator .. i am using the battery to power a spektrum AR610 Rx for the model.

Martin Harris12/02/2017 18:26:34
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8797 forum posts
215 photos

I would use a 2S LiFe pack (6.6v) - safe to leave/charge in the model and within the voltage range for most servos. In case of any doubt, you can always connect a 3 or 5A silicon diode in series with the input line to the receiver and it will drop it 0.6v

Edited By Martin Harris on 12/02/2017 18:32:36

MattyB12/02/2017 18:46:43
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1938 forum posts
30 photos

I agree with Martin - LiFe is a better chemistry in general for RXs and servos - but if you still want to run a Lipo just get a 5A rated switching BEC, or if it's a bigger model either retracts and flaps too a 10A would be safer (the Castle Creations one is good and is rated to a true 10A on up to 3S).

Ian Jones12/02/2017 20:52:25
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3218 forum posts
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If you are not tied to Spektrum, many Hitec receivers have a SPC connection which can take up to 35V.

Dave Wilshere12/02/2017 21:46:20
56 forum posts

All Rx's will take a 2s Li-Po battery, its the servos that need to be suitable. I always use Li-Po Rx packs, Li-Fe are fussy to charge properly like Ni-mh. Current of a regulator required comes down to the type and number of servos, but since its not a 3-D model a 3A constant load switch regulator or just regulator if you don't mind a sliding switches potential weak point. Powerbox Digi Switch or they do a stand alone regulator too

MattyB12/02/2017 21:51:58
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1938 forum posts
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Posted by Ian Jones on 12/02/2017 20:52:25:

If you are not tied to Spektrum, many Hitec receivers have a SPC connection which can take up to 35V.

Not a lot of servos can handle 35V though...!

Phil Green12/02/2017 22:05:50
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1515 forum posts
308 photos

That sweeping statement is simply not true Dave, not all receivers will take a 2S Lipo.
And charging a LiFe pack is the same CC/CV process as a Lipo, not 'fussy' in the least and nothing like the CC to delta peak process of an NiMh.

Cheers
Phil

Dan Murphy12/02/2017 22:20:15
2 forum posts
thanks guys iv ordered a 5amp BEC
Martin Harris12/02/2017 22:29:18
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8797 forum posts
215 photos

I've got to agree with Phil - LiFe cells don't need balancing on every charge, although it's no more difficult than with a LiPo, can be fast charged in situ as safely as NiXX cells and don't need the complication and additional failure point of a regulator to work with most servos. A123 and similar cylindrical cased varieties are virtually bullet-proof although I use soft cased ones regularly.

Edited By Martin Harris on 12/02/2017 22:31:54

John Tee13/02/2017 22:21:51
769 forum posts
65 photos

The SPC connection on hitec only powers the Rx not the servos

John

Rich too14/02/2017 06:34:53
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3013 forum posts
1070 photos

LiFe for me, I like the fact that they can be left in situ for charging unlike Li-Po.yes

Edited By Rich2 on 14/02/2017 06:35:21

Martin Harris14/02/2017 09:50:06
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8797 forum posts
215 photos

I store most of my models in the house so leaving LiPos in situ would be a no-no for me.

Trevor14/02/2017 10:13:05
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374 forum posts
52 photos

As one who frequents the slopes and flies electric from the flat, I now equip the gliders with 'retired' power packs from the electric models. These are mainly 3s LiPos which still have more than adequate capacity but whose equivalent internal resistance has got a bit high for high current applications. A 5v 3a uBEC is generally used for voltage regulation.

The downside, as has been mentioned, is that receiver packs are often buried deep in the nose of the glider and charging in situ isn't the best arrangement. However, because LiPos hold their charge so well and need charging so infrequently, I usually do this when needed, on the slope, so that model and charger are out in then open. Again, a larger electric flight 3s or 4s LiPo comes in handy for powering the charger.

I've nothing against LiFe batteries but, by not having any at all, my charger stays permanently on the LiPo setting, avoiding one source of human error.

Edited By Trevor on 14/02/2017 10:13:54

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