any electrical charging needs to go through the front terminals so that you don't bypass the electronic failsafes.
If you are worried about long term power supply during any procedure you need a bench charger that can provide 20-30amps constant. Trickle chargers can not do this.
Alternatively you can just make sure your trickle charger has topped off your battery already or go for a long extended drive of 30+ mins. This will be sufficient for quick flashes/coding that only take a couple minutes.
For longer flashing sessions such as iDrive/iStep, you need a bench charger
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