Quick Update after obtaining the LiHV H520 Leads, which work great!
I purchased a lightly used H520 kit 18-20 months back and didn't experiment with it much for a several months. Later examining the kit, 1 of the 3 batteries (Yuneec H520 OEM) wouldn't charge. It would fail instantly on OEM Charger and a few others I tried. I placed it aside for the time being due to not having LiHV charge leads.
After receiving
@SkyVidTek 3D Leads...
Using an iCharger 406DUO with a Server PS, the failed battery showed essentially a dead cell at 2.30 volts. 2 Cells were in the 3.0 range, and 3rd 2.8v. So overall the battery was probably placed into case expended and the long storage time depleted it further to the point of a normally considered - Bad NonUseable battery.
The 406Duo has the ability to inject extremely low trickle charge. I tried that with multiple fails due imbalance below 3v, but between each failure it would trickle a little charge. It'll also perform a Balance cycle, it too would eventually fail due to the cell being too low.
But cycling between small charge injections and balance cycles, over 12-16 cycles slowly got the low cell up to 3v. Increased amp to .3C and .6C and performed multiple balance charge cycles until low cell crawled up to 3.1v and others were 3.3-3.4. Bumped charge up 1C with a Balance Charge and was impressed the dead cell fully charged to capacity. Performed one Storage charge set to 3.8v and recharged at 1C to capacity.
Placed in H520, flew the battery to 22%, Cooled, recharged / balance to capacity and flew it to 18%.
No issues and stable... performed a Storage charge @ 3.8v and IR was pretty even in the 4-6R range.
Having LiHV leads, also showed the so-called 2-Good batteries also needed a few ChargeBal / Discharge cycles to condition them a bit better.
Conclusions...
The LiHV leads are essential to properly maintain the LiHV H520 Batteries.
Reconditioned a failed battery back to usable life.
This Charge station was configured for my Tattu Plus 22000mAh batteries for a modified S1000. But works great for multiple batteries.
iCharger 406 DUO
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900W 75A Server PW converted to Charger - slim & stable current.
These power supplies have been converted for R/C use with 3 pair of 4mm female bullet connectors and a 5V 3A USB port. The fan is automatically regulated. These units are not intended to be hooked together in series to create 24 volts.
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Charging Stand - 3D Printed - Holds iCharger over PS unit in a compact fashion.
(Or 75 amp.). to save space.
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