The AlphaBot uses batteries 18650.

But does anyone know if it should be the ones with the button top or the flat top?

Heres a button top: https://www.amazon.com/AllForBest-Protected-Panasonic-18650-Battery-Flashlight/dp/B0821SRZ31/ref=sr_1_1?crid=370I0UOE79SVT&keywords=panasonic+18650+battery+button+top&qid=1576283559&sprefix=panasonoic+18650+battery%2Caps%2C247&sr=8-1

And heres a flat top: https://www.amazon.com/Authentic-Rechargeable-Replacement-18650-LG-Battery-Flashlight/dp/B07YWRYZL4/ref=sr_1_8?crid=370I0UOE79SVT&keywords=panasonic+18650+battery+button+top&qid=1576283559&sprefix=panasonoic+18650+battery%2Caps%2C247&sr=8-8

How does one find information like this out? I've been looking through all the AlphaBot catalogues, electric shops, asking electricians, electric store clerks, google, raspberry pi fb chat groups and whatnot and nobody seems to know this.

To put this into a context, I have already wasted $150 purchasing 18650 batteries, only to find out they are not the version of 18650 batteries that are fitting. This time I really want to purchase the correct type of 18650 batteries. The other time I purchased 18650 batteries for the AlphaBot in a vape shop, only to find out that they are slightly too large for the AlphaBot.

Apparently 18650 is not the same as 18650.

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    where do you see that in those links? – john-jones Dec 13 '19 at 15:00
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    there are two types of 18650. flat and with hat on top. And i don't know which one to use. – john-jones Dec 13 '19 at 17:06
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    It would help if we had links to the batteries that are confusing you. Also, I'm not sure what you mean by a "hat." Are you referring a "bulge" like on a AA battery for the positive terminal? – kronenpj Dec 13 '19 at 18:21
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    i have now found out that its called "button top" and "flat top". i have updated the information. – john-jones Dec 14 '19 at 0:35
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    @Hermann Ingjaldsson, My apologies. I though there is no big deal. I was VERY WRONG! :((1) Flat Topped vs Button-Topped, what's the deal? - candlepowerforums candlepowerforums.com/vb/… (2) Battery, button or flat top lygte-info.dk/info/Battery%20button%20or%20flat%20UK.html (2) 18650 battery test 2011 - lygte-info.dk/info/Batteries18650-2011%20UK.html. Cheers – tlfong01 Dec 14 '19 at 3:08

All the individual 18650s I have ever seen have a 'hat' on one side, and are flat on the other. This prevents the batteries from being accidentally installed backwards.
When in doubt, put the battery in like you would a AA battery. The spring in the holder goes to the flat side of the battery, and the hat side goes to the flat side of the battery holder.

Now I have heard of 18650s that are flat on both ends, but I think they are solely for battery banks like this where space is at a premium.enter image description here

  • This indicates flat ones should not be considered for the AlphaBot. But I have another user saying "I do not recommend buying batteries with a hat on the top". So its all in the air. – john-jones Dec 14 '19 at 10:04
  • If you still aren't sure you could just buy both kinds and see which one fits. – Botspot Dec 14 '19 at 14:02
  • But again all the kits I've seen have the one-way batteries. – Botspot Dec 14 '19 at 14:03

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