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GPX Battery Replacement/Upgrade DIY

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GPX Battery Replacement/Upgrade DIY Empty GPX Battery Replacement/Upgrade DIY

Post  deutran Mon Aug 10, 2020 10:45 pm

If your like me and bought a GPX on release your batteries are most likely giving up the ghost after thousands of cycles.Here I am replacing the original Sanyo UR18650F's with Panasonic NCR18650B from 2500ma/h to 3350ma/h capacity at the same time.@$83.
Start by disassembling the unit as shown.Take care not to short anything out and spread the aluminium casing to slide the circuit board out gently.
GPX Battery Replacement/Upgrade DIY GPX-Pan18650bGPX Battery Replacement/Upgrade DIY GPX-Pan18650aGPX Battery Replacement/Upgrade DIY GPX-Pan18650cGPX Battery Replacement/Upgrade DIY GPX-Pan18650dGPX Battery Replacement/Upgrade DIY GPX-Pan18650eGPX Battery Replacement/Upgrade DIY GPX-Pan18650f

Next cut the tags to disconnect power from all cells both sides at the top,cut cable ties and remove cells.
GPX Battery Replacement/Upgrade DIY GPX-Pan18650gGPX Battery Replacement/Upgrade DIY GPX-Pan18650hGPX Battery Replacement/Upgrade DIY GPX-Pan18650i

Trim tags on new cells and fold over to allow expansion.Trim the tags on the circuit board as well.
GPX Battery Replacement/Upgrade DIY GPX-Pan18650j

Ensure good contact for the heat sensor (White silicone)on one cell.
GPX Battery Replacement/Upgrade DIY GPX-Pan18650k

Insert cells the correct polarity(Important!!!)Apply neutral silicone and cable tie.Solder the tags together.
GPX Battery Replacement/Upgrade DIY GPX-Pan18650lGPX Battery Replacement/Upgrade DIY GPX-Pan18650mGPX Battery Replacement/Upgrade DIY GPX-Pan18650nGPX Battery Replacement/Upgrade DIY GPX-Pan18650o

Reassemble sliding the circuit board into the 5th slot.
GPX Battery Replacement/Upgrade DIY GPX-Pan18650rGPX Battery Replacement/Upgrade DIY GPX-Pan18650p

Ensure the LED is positioned through the eye of the front cover.
GPX Battery Replacement/Upgrade DIY GPX-Pan18650q

Batteries came at 2x3.57V(7.14) and Charged is just over 2x4V(Cool so require 6-7 hours charge.Cut off for the GPX is approx 7.2(2x3.6V)so it is necessary for a full charge before use.
Some GPX batteries have a plug in battery cartridge so I will put up another post for these at a later date.
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Post  deutran Tue Aug 11, 2020 6:58 pm

Took the battery out for a spin today and worked a treat.Start voltage was 8Volts and after 4 detecting hours was at 7.7Volts.I'm expecting 8-10 hours use now by the looks of things.Only downside was no gold today doh!
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Post  Nightjar Tue Aug 11, 2020 7:08 pm

Surely saves buying a new one Deutran. Very Happy
Great display and instructions for anyone willing to give it a go, feel sure many will benefit.
Boobook put me onto this a few years back, was given a dead battery and once started it wasn't as difficult as first thought.




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Post  Ismael Tue Aug 11, 2020 11:21 pm

Good instructions for the older gpx's newer versions totally different as the have a battery pack with separate PCB...
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