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Not the greatest one, but definately not the worst one. 4 cameras and dvr- backup lasts around 4 hours, no difference day or night. 4 cameras only it took 13 hours to drain the battery, where 8 cameras it took around 8 hours. Dvr only, it took around 7 and a half hours for a backup to go dead. Purchase 2 of these units, connect your dvr to one of them and cameras to the other one. It will last around 7-8 hours.- that is what I need Hope it was helpfull.
Verified purchase: Yes | Condition: Pre-owned