This is an incredibly simple two cell 18650 Battery Holder. When someone thinks of 18650 Cells they tend to think of flashlights first, which is fair since that is what they have been primarily used for. However, with this battery holder you will gain the ability to incorporate 18650 cells into applications like robotics or prototyping by simply dropping one into this device and attaching the leads, that's it.
Every 18650 Battery Holder is equipped with two 6" cables for power and ground, each have been terminated with bare wire leads.
If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.
Skill Level: Noob - You don't need to reference a datasheet, but you will need to know basic power requirements.
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Based on 4 ratings:
I installed the batteries and it worked fine. I tried to remove the batteries and it was difficult until removed the wings. It would be fine if the batteries remained installed.
Good construction, delivered on time. The batteries are held in tightly so much so that they are difficult to remove.
Ordered two of the 18650 batteries and THIS battery holder. It is a VERY tight fit. But it does work ok.
I just bought 4 for my project as I only had one holder from another kit and I needed 5. When I tried to put in a 18650 battery, it wouldn't fit! The new holder (case) is 3 MM to short when compared to the one that works. Unfortunately I will need to return the holders and go find another supplier. First time I've ever had an issue with Sparkfun. I think this one slipped through the cracks.
Have you contacted our technical support @ firstname.lastname@example.org about a potentially mis shipped item? I just went down stairs and tested 20 of these with our 18650's and while they were quite tight to get out, all of them went in easily. Tech support might be able to get you straightened out with the proper battery holders that meet your 18650 requirement.
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How do I remove the batteries from here? THEY ARE STUCK D:
These holders look identical to some I have. I'm not sure of the exact gauge, but the safe current limit is certainly no more than 2A. Many 18650 are intended for bright led flashlights and have current limiting at 2-2.5 A. I use these holders on small robots which draw < 2A.
If you need higher current, I recommend Li batteries designed for RC hobbies. These will yield much higher current and have suitable connectors. Be aware that RC cells usually have NO internal protection.
Please note that this holder will not accommodate the slightly larger 18650 protected cells.
Just a question. When you have two batteries in here, is the voltage 3.7 or 7.2? As in are they connected in parallel or in series?
Zooming into the second pic, you can see a strip of metal connecting the bottom contacts and no metal piece connecting the top contacts. Another clue is the orientation of the left and right battery. The positive and negative ends are aligned with each other. Had they been in parallel the positive end of one would have been aligned with the positive end of the other battery. Not to say there couldn't be some crazy wiring to contradict what I'm describing, but that would add unnecessary expense to the part.
Absolutely correct. I have these. They are in series, but I easily modified the holder to be parallel. I soldered the red and black wires together, and soldered a new wire to the other end. Perfect.
How much current can these take? I have some 18650s with 10C discharge capability, are these holders sufficient? I've had 18650 holders melt from the current before, and am looking for holders that can take the current.
To help answer this question, if the information page could specify what gauge the 6" wire leads are, then we could do the current capability analysis from that. Typical battery holders like this have pretty tiny leads; I hope these are at least a little bit beefier.
I'm going to order a few of these. If it hasn't been posted by then, I'll post what gauge the leads are.
I've never had issues with the wires themselves, it's always the springs that have issues (they heat up due to the current and loose their spring)