RC Tank Warfare community hobby forum

My mistake totally different. Had a look at how the packs are made up, the only danger is using a soldering iron . The preferred method is spot welding strips to the battery. they don't like a build up of heat, most recommend a high powered soldering iron for a fast joint.

I try to be quick with the heat when making up my battery packs. I’m not sure if it really helps but I wrap a cool wet paper towel around the battery when I solder. Poor man’s heat sink.
So far my batteries have worked very well.

Is there a way to know what capacity you end up with? I made a battery once but the cells did not state mah. I assumed it was 1500mah.


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I’m not sure about that. Sounds like a Rad question.

RenoirLV wrote:Is there a way to know what capacity you end up with? I made a battery once but the cells did not state mah. I assumed it was 1500mah.


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Yes, fully discharge the battery, charge it, and in the charger screen you will see how many Mahs you put inside.

Of course you need a charger with a screen.

I found this chaps video he did on testing Li-ion makes very interesting.

Watch "Will China's 18650 Battery Beat LG, Samsung, Sony & Panasonic? Let's find out!" on YouTube

Informative video. Guess I’ll be sticking with name brand batteries.

Personally, I opted for 21700. 21 corresponds to the diameter, 70 to the length of the elements. More autonomy for a format barely bigger, that suits me! On the NKON site, you can ask to have pre-welded metal legs, which prevents the elements from overheating.
(in the photo, a pack of 18650 with the 21700)


If anyone is interested, here is the link:
https://eu.nkon.nl/samsung-inr21700-40t ... h-30a.html

If you put together two of those will it be 4000mAh? That’s a crazy number for that size.


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Yes, you get a 7,2V 4000 mAh battery. Really good for the seize