Cheap batteries!!!

[Matthewdupreez]

Hi guys I'm in a pickle.......
So I can't afford proper rc plane batteries....
But I have access to 3.7 v 300mah, batteries they arent lithium iron I think they are lithium polymer.
U can find them on aliexpress or banggood pls let me know how I could use them...
For a simple FT Cub.
Thanks
Matthew

 

[JasonK]

can you take a picture of it? 1s 300mAh wouldn't fly a FT Simple Cub. The recommended battery for the FT Simple Cub is a 3s 1300mAh (way bigger then that).

the battery your have sounds like it might be ment for the mini plans (12-18" wing span) or a tiny woop. if it is actually lithium-ion and not li-po, it likely doesn't have the C rating (how fast you can discharge it) to fly anything.

 

[Matthewdupreez]

I'll send a pic... But I was wondering if I could wire them in series and parallel

 

[Matthewdupreez]

It defeniately is li-po

 

[Matthewdupreez]

https://m.aliexpress.com/item/32956...er_id=8386cb1f763341ad86f076b73e2b8b3b&is_c=N

 

[Matthewdupreez]

https://m.aliexpress.com/item/32956...er_id=8386cb1f763341ad86f076b73e2b8b3b&is_c=N

 

[Matthewdupreez]

I was wondering whether it can be wired in series and parallel

 

[Timmy]

it can

 

[JasonK]

disregarding the issue with battery balance (if battery cells aren't well balanced you can get some issues..) to get something close to 3S 1300 mAh you would need 12 of them wired up as 3s4p and I still am not sure if they could put out the current needed for the motor recommended for the plane in question.

 

[Matthewdupreez]

Yea so the battery alone happily runs 2.5 amps one battery

 

[Matthewdupreez]

Aka I can easily pull 2.5 amps from one battery and it doesn't even get warm

 

[Timmy]

disregarding the issue with battery balance (if battery cells aren't well balanced you can get some issues..) to get something close to 3S 1300 mAh you would need 12 of them wired up as 3s4p and I still am not sure if they could put out the current needed for the motor recommended for the plane in question.

I agree, the batteries need to balanced exactly but I'm pretty sure they could put out the current needed. But then again I could be wrong.

 

[Matthewdupreez]

So with 12 batteries I could get 8 amps at 14.8 volts

 

[Ketchup]

As people have said, it can be done, but it is probably safer and cheaper to just get a 3s battery from hobby king or something. They might not ship right now though.

 

[JasonK]

given that most FT planes get 5-10 minute flight times - it is likely pulling an average of 15.6A. The ESC that comes with the recommend power pack is a 35A ESC, so they they have it setup to be able to pull well over your 8 amps your stating.

The recommened lipo is a 45C battery, the only thing close to what you showed that I could find a C rating on it was 20... setup as indicated it would only have about 45% of functional current draw rate as the recommended battery.

 

[Ketchup]

Ok, so if you were going to get 12 of those batteries to connect together, they would cost around 20 dollars total (if my calculator isn't lying), and they still wouldn't supply the power needed. A turnigy 1300 3s 30c battery from hobby king is just over 12 dollars. Sure, the shipping will be higher, but if you get more than one it should be worth it.

 

[Indy durtdigger]

I has questions? 12 of those batteries at 1.69ea is in U.S. dollars is $20.28. If you can swing that than a battery like this one is within your grasp and I'm sure cheaper equivalents can be found.https://store.flitetest.com/gens-ace-3s-lipo-battery-25c-11.1v-2200mah-gea22003s25x6/p792030

@Ketchup ninja'd me lol and with a cheaper option.

 

[Matthewdupreez]

Ouch.....OK I guess I'll try to find a couple of the proper ones.
If south Africa has any.....I couldn't even find a single servo for less than $50...

 

[Matthewdupreez]

But I'll give it a try or just order a proper rc battery from china

 

[Indy durtdigger]

Ouch.....OK I guess I'll try to find a couple of the proper ones.
If south Africa has any.....I couldn't even find a single servo for less than $50...

Do you have access to Banggood there?