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Originally Posted by MacFlightSierra
My idea was to use the IFI supplied charger for that battery, instead of the battery itself (hook up the charger output to the BackupBatt RC Input). I measured the charger outputs- 8.0v @ 750mA -just like the backup battery itself.
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Mac,
It is never a good idea to use a battery charger as a power supply. Frequently chargers use a pulsed DC output that is well above what you might be measuring. If your backup battery runs down in 3-4 minutes there is something wrong. Either the charger isn't fully charging the battery, or it has a defective cell or there is a short in the wiring to camera or the camera has a defect and is drawing too much current. You need to find the reason and correct it.