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Editing Step 73 —

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The two battery packs are wired in parallel to the OpenROV Controller Board.

Place three fully-charged 26650 batteries in each tube, positive end forward.

Close the tube and secure it with an extra 157 O-ring.

Using a digital multimeter, measure the voltage across each battery tube at the DB-25 connector. You should have around 12 volts dc.

Make sure the polarity is correct! Refer to the DB-25 wiring diagram.

The batteries can be left in the battery tube safely and without being drained because the OpenROV is turned "on" by plugging the mini-USB cable into the Topside Adapter. (We will do that later).