BCP 8pcs Plastic Li-ion DIY Battery Case Holder for 4x3.7V 18650 Batteries

Don't know why people complain about the tight fit of these holders. I don't think they're aware of the importance of the contact points necessary for 18650 high amp discharge capability. They're perfect for 18650. They're tight enough to keep the battery from wiggling or popping out. Just use a little leverage taking them out. A pen or a screw driver will do it. If you use anything metal to pry them out, be sure to do it on the negative side of the battery or you'll risk a short making contact with the center of the positive with the edge being negative. I personally used these to make nice battery packs by soldering them a pair at a time together at the leads at the bottom and epoxy or crazy glue on the sides. Then use nice heavy copper wire for a bus running down the center where the leads meet and solder the copper right onto the leads to get your series or parallel configurations. You can solder the whole length of the assembled holders and clip the copper in any place you need to make parallel or series combination as well as flip the batteries in alternating orientations. Just make sure you mark your orientations so you don't accidentally put the batteries in in the wrong way or you'll have a short and probably burn your pack if you leave it in wrong before long.

They are great as you can see by the photo I have altered them to make a single 24 cell charger for A icharger x8... Very easy to do take solid wire run one on the top solder all the tabs run 1 on the bottom solder all the tabs and then solder 1 wire on the top 1 wire on the bottom for a positive negative to a XT60 plug.... Enjoy if you do it the way I do it works amazing and your able to charge a higher amps because you have more batteries

works great as expected

Works great.

Work good for charging and testing my 18650 cells but maybe just a little too tight... hard to get batteries back out after testing

Fits cells snuggly. Tabs are solid.

good deal