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This is my charging tray: https://www.thingiverse.com/thing:215677...
and again a link for the exact charger I use: https://www.ebay.com/itm/P2012-l3-12-6v-...
The 3.7V batteries would be LiIon not LiFePO4. the LiFePO4 have 3.33V which adds up to the 10V. 3.7V * 3 sums up to 11.1V. Which I didn’t want to try back then (risk of damaging the camera with over voltage). But there is now a company offering LiPo battery replacements (see here for picture: https://www.photoscala.de/2017/10/05/neu...).
SO to sum it up, the 11.1V doesn’t seem to be a problem for the cameras. To do so, you will need another BMS Board (for 3S LiPO/LiIon) though to have another cutoff voltage.
I am using one of these: P2012-l3 12.6v 1.5a LiPo Lithium Ion Charger for 11.1V Li-ion Battery
The PCB BMS Protection Board for 3 Packs 18650 LiFePO4 LiFe Battery Cell 3S does the balancing and cut off. So every “C.V. Voltage for LiFePo4: 10.8V±1%” should work.
Hey guys, sad to hear it’s not yet working for you. The initial current the camera draws is pretty high (around 4,5A peak). So make sure the cells you chose can deliver this current.
Worked perfectly with a 4th generation and a WD60EZRX!
Slowly start peeling at one corner... worked better than shown on the pictures.