Will I need a dedicated electronics battery?

[Bonanza]

Adding livescope. Currently have a Lowrance Gen 3 9&12 inch unit, adding Echomap Ultra 102 and “black box”
Looking at power consumption specs....HDS9 -1.5 amps, HDS 12 -2 amps, Garmin 102 “26 watts” (? 2.2 amps) and GLS 10 livescope box “21 watts” (? 1.8 amp). Total 6.5 amps draw.
All hooked to charging battery- Duracell 31 AGM with the following specs....
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Not sure how to interpret the above data. Boat is at our lake house, Usually fish 4-6 hours, dock for lunch and plug charger in, go back out in 1-2 hrs for the afternoon. Charge batteries overnight

will the duracell get it done or do I need additional battery?

[bobcoy]

I say good to go till proven otherwise. Use the 20 hour number(105 Ah) and the 25 Ah rate (210 min) Using your numbers on the draw. Bob

[Bonanza]

I say good to go till proven otherwise. Use the 20 hour number(105 Ah) and the 25 Ah rate (210 min) Using your numbers on the draw. Bob

sorry, but please explain.

[Jig_Man]

I imagine that the way you fish and charging mid day you can probably get by. I had 3 Lowrance HDS units with power poles when my battery was new it did the job. After some age it didn’t. The ability to charge during the day may be a game changer.

[haus9393]

Pretty sure the live scope box is more like 4-5amps alone. I’d say you will be fine with that group 31 agm. I would guess you will be closer to 10amps of power draw. Which that battery should last a solid 7-8 hours without charging or running the motor.