How do I get to the internal battery in my furuno 1650f gps

https://manualsbrain.com/en/manuals/792146/

You would obviously be better served if you learned how to google it
https://downeastboatforum.com/threads/1650-battery-replacement.12881/

The battery is soldered and glued into the unit.The battery is a CR2450-3 volt lithium battery and apparently, easily found at radio shack for 7 bucks.

You can't write to a chart card if that's what you're referring too.

Hi!

Your Furuno Does NOT have an internal antenna. You have no choice but to install the external one.

Hope this helps.

depending on which port you are referring to: The power has 3, the datas have 6 and 7 and the transducer plug has 10 pins.

There is an internal 3 VDC battery that needs to be replaced in the unit. Any marine electronics repair shop should be able to perform this for minimal cost. We charge $75 for the repair. Please contact me if you need any more help or want to send the unit to me for repair: [email protected].

internal damage to the display, fixable by Furuno, and probably economically feasible (guess $250 with round trip to Furuno)

Furuno just stopped producing these models about a year ago. They use a special chart card. You can still purchase the cards from Navionics or C-map if you need to. I will tell you from experience that you should get your internal battery changed out if you havent done so already to keep from losing your settings and waypoints. The dealer will have to save them for you though and put them back on. Furuno made a GP7000 to replace this one and it's uses SDcards and is nothing like the rest of Furuno's product line. The best replacement for this unit is the Garmin GPSMAP 700 series. You can use your old furuno transducer if you have one (with an adapter plug). This garmin unit also has a built in GPS or you can use an external one. The 700 series will be shipped in April. Check out Garmin's website or mid-shore electronics.

the leading edge of the ducer should be higher than the aft portion. The leading edge must not be below the bottom of the transom. To determine if it is turbulence or radiated interference, put the boat in neutral and run motor up in RPM, if it fails then, with boat stationary, then proximity to motor is a problem and you should buy and in-hull ducer. glueing the transom ducer may or may not work well.