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pax 2 battery replacement

PAX 2 Battery replacement guide

Philip Haasnoot
Aug 15, 2017 · 7 min read

Stop throwing shit out…. I never bought into the “Disposable” society that discards technology as soon as the next best thing comes out. This guide will show you how to repair your perfectly good PAX 2 with a new battery and breathe new life into an already outstanding product.

Let me start by saying that PAX is a phenomenal com p any that has shown with each iteration of the PAX vaporizer that they can innovate. How good of a design is the PAX? At one point I thought to myself “I should get into the vaporizer industry.” One day shortly after that thought my fiance came home with a PAX 1 and I was so impressed with the overall design and functionality that I changed my mind about making a splash in that industry.

TLDR; The PAX is one of the most well designed pieces of vaporizing equipment around. Highly recommended.

But the one Achilles heel of even the most well engineered product is always the lifespan of their battery. In the case of the PAX this comes from the internal lithium cylindrical cell, which generally can be charged to around 500 cycles before you see degradation of the capacity (it will store around 70% of the original capacity at 500ish charges). As time goes on the cell will hold less of a charge, heat up slower due to decreased current output, and generally cause the end user to be frustrated.

This is a great tear-down of the PAX 2 so you can ogle at the guts of the device. This is however destructive and we can’t take the milling machine approach since we want to keep using our PAX 2.

This article will walk you through the process of changing the 18650 sized lithium cell and effectively double the life of the product.

DISCLAIMER

This process will require you to be proficient with several types of tools including power tools, soldering equipment, and a firm grasp of common sense. You are performing this repair at your own risk, it WILL void your warranty; however this warranty does not cover the battery so if you want to revive your device this is the only way to do it. PERFORM THIS PROCESS AT YOUR OWN RISK, I assume NO responsibility for personal injury or damage to your device.

With that said here is the list of parts you will need:

  1. NCR18650B protected Lithium cell — $8ea
  2. Solder braid or small battery tabs

And the tools you will need:

  1. Soldering Iron — I have the older version of this Hakko, going on 6 years it hasn’t failed me yet.
  2. PCB Endmill or small drillbit — something around 1/16″ in diameter
  3. Dental Pick or Small Flathead screwdriver
  4. Double sided tape
  5. Spudger or similar prying tool

Alright so if you watched the teardown video linked above you will know that the guts of your PAX 2 are held in with a clever key that also holds the pogo-pin targets for the charger. We need to remove this in order to access the battery compartment:

STEP 1 — Drill baby Drill

Take your endmill/drillbit and drill a small hole in the plastic key to give us a place to start prying it out. Unfortunately I choose to start prying on the very end and in the wrong direction and fractured the key, I have a 3D model that you can 3D print to replace the key entirely posted at the bottom of the article in case you completely demolish yours.

Stop throwing shit out…. I never bought into the “Disposable” society that discards technology as soon as the next best thing comes out. This guide will show you how to repair your perfectly good PAX…

Pax Vaporizer Battery Replacement

Introduction: Pax Vaporizer Battery Replacement

Replacing old battery with a high capacity Panasonic NCR18650B in Pax Vaporizer.

  • T4 Torx driver
  • Knife
  • Soldering iron
  • Solder
  • Shrink tubing
  • Electrical tape
  • Replacement 18650 Lithium Ion battery with pre-welded tabs

Step 1: Disassembly

Remove a single T4 Torx screw from the back of the unit.

Step 2: Disassembly, Cont.

Slide the cover toward the mouthpiece. The cover is very tight and may require some force to slip off the unit. Be careful not to loose 2 little bowl magnets as shown in the image.

Step 3: Disassembly, Cont.

Once the cover is off, you will see the internal circuitry and a single battery cell taped to the unit.

Step 4: Battery Removal

Carefully cut the tape, remove it from the battery and slide the battery out of its compartment.

Step 5: Disconnecting Battery

Simply rip the weld tabs off the battery.

Step 6: Insulation Removal

Using a knife, cut and remove the shrink tube insulation from the weld tabs and wires. After shrink tubing is off, the solder joints will be visible. Use a soldering iron to desolder tabs from the wires.

Step 7: Prepare the Wires

Slip new shrink tubing over the wires. You can also use electrical tape in the later steps if you don’t have shrink tubing.

Step 8: Connect New Battery

For a replacement, I used Panasonic NCR18650B 3400 mAh battery. This cell had the solder tabs spot welded on in our shop. The tabs are thinner and narrower than standard weld tabs in order to match the original.

Solder the wires to the terminal tabs only.

Do not solder directly to the battery.

Step 9: Complete the Insulation

Slide the shrink tubing over the terminal tabs and solder joints leaving as little of the tabs exposed, as possible. Heat them up with a hair dryer or a heat gun to shrink in place.

Step 10: Re-assembly

Insert the battery back into its compartment and replace the tape that was cut during the disassembly, any electrical tape will do. Slide the cover back over the unit, replace the torx screw.

Your Pax will not turn on. Don’t worry, you just need to “unlock” the internal protection circuit. Simple place your Pax on its charging base and make sure that it is plugged in. Watch that light come to life!

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Pax Vaporizer Battery Replacement: Replacing old battery with a high capacity Panasonic NCR18650B in Pax Vaporizer.Tools needed: T4 Torx driver Knife Soldering ironMaterials needed: Solder Shrink tubing Electrical tape Replacement 18650 Lithium Ion battery with pre-welded tab…