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Battery Tube Adapter for Li-FePO4 Batteries

This guide will show you the step by step for building the battery tube adapter for Li-FePO4 batteries. You only need to do this if you plan on using Li-FePO4 batteries AND you have a version 2.5 or 2.6 kit. The battery tubes on the 2.5 and 2.6 kits a

  • Author: OpenROV
  • Time estimate: 30 minutes
  • Difficulty: Easy

Edit Step 1 Battery Tube Adapter for Li-FePO4 Batteries  ¶ 

Image 1/2: This adapter comes in all 2.6 kits with serial numbers 1200 and above. Image 2/2: If you have a 2.5 or 2.6 kit with a serial number below 1200 and want to use these batteries, you can order this adapter on our webstore.

Edit Step 1 Battery Tube Adapter for Li-FePO4 Batteries  ¶ 

  • If you want to use the Li-FePO4 batteries that come from Batteryspace (they are white and slightly shorter than the Trustfire 26650s) you will need this adapter.

  • This adapter comes in all 2.6 kits with serial numbers 1200 and above.

  • If you have a 2.5 or 2.6 kit with a serial number below 1200 and want to use these batteries, you can order this adapter on our webstore.

Edit Step 2  ¶ 

Image 1/1: 2x polyfuses, 4x battery terminals (button style),2x acrylic adapters

Edit Step 2  ¶ 

  • You will need the following:

    • 2x polyfuses, 4x battery terminals (button style),2x acrylic adapters

    • Superglue

    • Soldering iron/solder

    • Helping hands are helpful :)

    • Hobby knife

Edit Step 3  ¶ 

Image 1/2: Image 2/2:

Edit Step 3  ¶ 

  • Sand both flat sides of the acrylic part shown here for better hold for the glue.

Edit Step 4  ¶ 

Image 1/1: Note that it is at a slight angle.  This is because the polyfuse has feet that are going to fit through the holes at the bottom and the feet are offset from the center on each side.

Edit Step 4  ¶ 

  • Super glue the button terminal as show, with the small hole at the bottom of the slot.

  • Note that it is at a slight angle. This is because the polyfuse has feet that are going to fit through the holes at the bottom and the feet are offset from the center on each side.

  • You don't need much glue.

Edit Step 5  ¶ 

Image 1/3: Insert one of the legs through the small hole in the battery terminal as shown. Image 2/3: Insert one of the legs through the small hole in the battery terminal as shown. Image 3/3: Insert one of the legs through the small hole in the battery terminal as shown.

Edit Step 5  ¶ 

  • Once the glue dries, bend the legs of the poly fuse in opposite directions as shown.

  • Insert one of the legs through the small hole in the battery terminal as shown.

Edit Step 6  ¶ 

Image 1/1: Put the other battery terminal on the opposite side, threading the other leg of the poly fuse through the hole.

Edit Step 6  ¶ 

  • Bend the leg over the top like so.

  • Put the other battery terminal on the opposite side, threading the other leg of the poly fuse through the hole.

  • Superglue it as well.

  • Bend the polyfuse leg on this side too.

Edit Step 7  ¶ 

Image 1/2: Use a lot of heat for this to make sure there's a good solder joint. Image 2/2: Use a lot of heat for this to make sure there's a good solder joint.

Edit Step 7  ¶ 

  • Once the glue dries on the other side, solder the legs to the surface of the battery terminal.

  • Use a lot of heat for this to make sure there's a good solder joint.

Edit Step 8  ¶ 

Image 1/1: CAUTION! The Trustfire charger we recommend has two settings (3.0V and 4.2V).  Charging your batteries on 4.2V can destroy the batteries.

Edit Step 8  ¶ 

  • Charge your batteries.

  • CAUTION! The Trustfire charger we recommend has two settings (3.0V and 4.2V). Charging your batteries on 4.2V can destroy the batteries.

  • Set to 3.0V for the Li-FePO4 batteries!

Edit Step 9  ¶ 

Image 1/3: You can see the positive terminal in the picture doesn't poke out very far from the top of the heatshrink. Image 2/3: The negative end of the battery is even worse, below the heatshrink. Image 3/3: When they go into the tube they might not make good contact.

Edit Step 9  ¶ 

  • Some of the Batteryspace Li-FePO4 batteries don't make good contact with the cell above them.

  • You can see the positive terminal in the picture doesn't poke out very far from the top of the heatshrink.

  • The negative end of the battery is even worse, below the heatshrink.

  • When they go into the tube they might not make good contact.

Edit Step 10  ¶ 

Image 1/3: Image 2/3: Image 3/3:

Edit Step 10  ¶ 

  • To fix this, simply cut some of the heatshrink away from the bottom of each of the batteries as shown

Edit Step 11  ¶ 

Image 1/2: Image 2/2:

Edit Step 11  ¶ 

  • The battery adapter is complete and can be put into the tube at the front. Make sure the lead coming from the battery tube's positive endcap terminal runs through the slot on the bottom of the battery tube adapter. Look at the picture for a good insertion.

You're Done!

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