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Connecting two batteries in a model.

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Cliff Bastow17/03/2019 11:24:10
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824 forum posts
426 photos

Hi all,

I have a twin electric model that needs quite a lot of weight in the nose so I thought I might as well fit in a second battery as there is room and I might as well make use of the extra weight.

I want to use 2 batteries as all my models use 3s 2200 batteries and I do not want to buy larger ones just for this model.

My question is this, is it better to keep the batteries separate, ie one powering each motor or wire them in parallel so in effect it makes a 3s 4400 battery and run both motors off it?

My thinking is the latter as if they were separate and one battery ran down before the other for any reason i would then get asymmetric thrust but I am by no means an expert.

Thoughts please?

Cliff.

John Rudd17/03/2019 11:31:42
96 forum posts
2 photos

Running in parallel gets my vote.....

Piers Bowlan17/03/2019 12:41:02
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1826 forum posts
44 photos

Gets my vote too, although I have never tried it! Not so keen on the idea of parallel charging however but I know many on this forum do so routinely.

Cliff Bastow17/03/2019 12:43:21
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824 forum posts
426 photos

I wont be charging the batteries together, just using them in the model, By the way they will both be the same make and spec.

cheers Cliff.

Alan Gorham_17/03/2019 14:06:10
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924 forum posts
98 photos

I've done it a few times with no ill effects.

I've always used packs bought at the same time and I keep an eye on the internal resistance of each pack as they age.

I've done it on my Halifax for 14 years and my Beaufort for 12 years so it's fairly well proven....

colerne2011 217.jpg

colerne2011 384.jpg

Former Member17/03/2019 14:29:37
1322 forum posts

[This posting has been removed]

Cliff Bastow17/03/2019 14:40:23
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824 forum posts
426 photos

Thanks for the advice guys, that is basically what I thought.

Lovely models by the way Alan, especially like the Beaufort.

Cheers Cliff.

Former Member17/03/2019 14:43:01
1322 forum posts

[This posting has been removed]

Martin Harris17/03/2019 14:58:48
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8739 forum posts
214 photos

At one time it was common practice for battery makers to assemble packs in parallel - designations such as 4000 4s2p denoting a pair of 4s batteries paralleled together (with the balance leads also connected in parallel internally coming out as a single lead/plug).

I have 2 4000mAh Rhino packs configured as above which are donkeys years old and have seen very regular service in a model used as my go-to hack for most conditions - they still give over 3600 mAh with plenty of reserve after several hundred cycles (I habitually fly them in a telemetry equipped model which alarms at this point although they are still producing good power) so parallel charging does not appear to have harmed them at all.

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