Introduction
Moza made great quality gimbals for a few years before DJI blew them out of the water (personal opinion, but true). Unfortunately, they have terrible after purchase care, and basically no warranty.
If you do a bit of searching, you'll discover Gimbal users with Gimbals that no longer work -- the main reason, 1 of the custom 18650 batteries dies and Moza wants you to pay $50 for 4 new batteries. The catch, It will happen again, and next time you may even find the batteries in stock.
Don't fall for Moza's scam. You can buy great quality 18650 batteries and make them work in your gimbal.
To make sure this is an issue with your battery. Use a multimeter to check each battery's voltage.
If you have 5.5mm barrel jack connector, you can test power on the Moza gimbal with an external battery or power supply (google the specs on your device to power it properly).
If the Gimbal works with external power, and a battery reads low or 0 Volts on your multimeter, then it's time for you to fix the bad battery and get back up and running!
Tools
Parts
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Moza modified 18650 battery. DIY easy fix.
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The Moza batteries are slightly modified 18650 batteries with an additional ~1.5-2mm battery cap.
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You can take cap off your old battery by simply removing the plastic around the battery (moza label only). and carefully prying off the cap with a small screw driver or flat tool.
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If you don't have your old Moza batteries, you can circle bend solid copper wire and attach it to your battery. You'll want solid contact for this too work.
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For more advanced users. You can take your old cap from the Moza battery and solder it right back onto the new 18650 battery. It is recommended that you have PVC battery heat shrink to secure it all back in place.
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Make sure you work quick and do not heat up the batteries, they can catch fire. Also, do not do this when the batteries are fully charged. If you move fast and pre-tin the back of the battery cap and top of the battery, the solder should join together quickly.
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If you are replacing all of your moza batteries with new 18650 batteries. Just remember there is a 3mm gap that needs to be filled for the gimbal to make a good connection with your new batteries. You can coil more copper, or any conductive layer 3mm thick in between your batteries for a solid connection.
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Put the battery back in your device and power it up.
In conclusion. Moza sucks, and I made this tutorial for you out of spite and lack of support from them. Hopefully this helps you save some $ and keep filming.