how do you connect the balancing leads without cutting into the battery? YOur output lead - based on the XT connector- seems to be just - + , did you custom make a balancing lead to connect directly to the external terminals?
Yes, it is only plus and minus required because DJI Mavic batteries have already integrated the balancer...
So you only determine the voltage (cell number xS) and current, everything else does reliably the DJI battery.
Finished charging cables are available on eBay, but the search is a bit annoying. The finished cables usually have banana plugs, but I basically use XT 30/60/90, etc. So I've soldered XT60 to my cables.
An alternative is the purchase of a cheap car charger for DJI batteries, the plug to the battery are usually of good quality.
Cut the cable, determine the polarity and solder an XT60 to the cable. If you use XT60 male and female, of course you can continue to use the Car Charger.
The RC-Charger has to be able to charge without balancer-connection, but meanwhile nearly all modern RC-Charger can do that.
Using the example of the ISDT Q6 Pro with M1P battery, it is done as follows:
1. Connect your ISDT charger with a suitable power supply 7.5 - 32 volts. Well suited, for example, notebook power supplies 90 to 120W.
2. Turn on the charger.
3. Connect a switched ...OFF... M1P battery with the charger.
4. Select the cell type on the charger...LiHv / 3S / 4.35V / 0.5 to 3.8A*
... *1.5C = 5.7A max ...
5. Turn ...ON... the DJI battery and the charger will show the current battery voltage.
Note: Batteries that can not be switched ...ON... can not be charged with the charger!
6. Start the charger, and it will ask if the charging process should be done without balancer connection, which must be answered in the affirmative.
7. The charging process begins.
When the battery is full, it automatically disconnects the RC charger, which then gives an alarm because of the broken connection.
Overcharging the M1P batteries is NOT possible. Even a deep discharge prevents the DJI battery by disconnecting as soon as only one battery cell drops below 3.3 volts.
In addition, the battery of the M1P detects too high charging voltages, as well as a possible overheating. The result is shutdown and refusal to accept the charging process
!!! In spite of all safety, charging must never happen unattended. And I can give no guarantees for my information given here. So get yourself several opinions, and always decide on your own responsibility !!!
Further advantages:
+ You can determine for each charging process whether to charge gently or quickly.
+ You can choose to have a complete charge or up to a certain storage voltage of, for example, 3.89 Volts per cell (3S / 11.67V / 65%).
+ Discharging for capacity determination can be done, but most RC chargers are unsuitable because no high discharge currents can be generated. Of course there are special dischargers for this purpose, such as the SkyRc BD200 ...