Fish finder batteries
Screens on from first light to the last cast.
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11 hours
A 1 A fish finder on 10Ah
Garmin STRIKER rated current
11 hours
HELIX 10 + MEGA Live
On Redodo's 16V 30Ah Fish Finder
7.63 lb
For a full live-sonar day
$189.99 when we checked
How long your electronics run
| Unit (maker's draw) | Dakota Lithium 12V 10Ah Mini ($85) | Redodo 16V 30Ah Fish Finder ($189.99) | Redodo 12V 50Ah Bluetooth ($215.99) |
|---|---|---|---|
| Garmin STRIKER (4 to 9 in) (opens in a new tab) (1 A) | about 11 hours | about 40 hours | about 53 hours |
| Lowrance HOOK Reveal 5 (opens in a new tab) (0.9 A) | about 12 hours | about 44 hours | about 59 hours |
| Humminbird HELIX 7 MEGA DI/SI G4N (opens in a new tab) (0.95 A) | about 11 hours | about 42 hours | about 56 hours |
| Garmin ECHOMAP UHD2 7x (opens in a new tab) (1.1 A) | about 10 hours | about 36 hours | about 48 hours |
| Humminbird HELIX 10 MEGA DI+/SI+ G4N (opens in a new tab) (2.7 A) | about 4 hours | about 15 hours | about 20 hours |
| Humminbird MEGA Live (live sonar) (opens in a new tab) (0.93 A) | about 11 hours | about 43 hours | about 57 hours |
| Garmin LiveScope Plus (live sonar) (opens in a new tab) (1.75 A) | about 6 hours | about 23 hours | about 30 hours |
| HELIX 10 + MEGA Live (3.63 A) | about 3 hours | about 11 hours | about 15 hours |
| ECHOMAP UHD2 7x + LiveScope Plus (2.85 A) | about 4 hours | about 14 hours | about 19 hours |
Draws from each maker's manual or spec sheet (Lowrance from its spec sheet as posted by a dealer); LiveScope Plus is its 21 W typical figure divided by 12 V. Hours are the battery's rated watt-hours divided by watts at 12 V. Screen brightness and transducer settings change the draw. Prices checked October 20, 2026.
Our picks
Best for live sonar and bass boats
Redodo 16V 30Ah Fish Finder
A dedicated electronics battery at 16 V, which Redodo says gives a brighter screen, in a case small enough to tuck under a console. It keeps your sonar on even after a long day drains the trolling batteries.
- HELIX 10 + MEGA Live: about 11 hours
- 7.63 lb
- Bluetooth gauge
- Charging pauses below 32°F
Best for a kayak: one battery for motor and screen
Redodo 12V 50Ah Bluetooth
Runs a trolling motor up to 70 lb thrust and a fish finder from one 11.27 lb battery. A HELIX 7 alone would run for about 56 hours on it.
- 640 Wh
- 11.27 lb
Best for the ice shelter
Bluetti Elite 30 V2
A 288 Wh power station with a 12 V car outlet for the fish finder, plus USB and wall-style outlets for phones, lights and a camera. It sits on the ice, not on your sled seat.
- 1 A fish finder: about 20 hours
- 288 Wh
Myths, answered
Frequently asked questions
What size battery do I need for a fish finder?
Most fish finders draw about 1 A, so a 10Ah lithium runs one about 10 hours, more than a long day. Add live sonar or a 10-inch screen and step up: a Humminbird HELIX 10 MEGA DI+/SI+ G4N with MEGA Live draws about 3.6 A together, which a 16V 30Ah Fish Finder battery runs for about 11 hours.
How long will a fish finder run on a battery?
Divide the battery's watt-hours by the unit's watts (amps x 12). A 12V 10Ah lithium holds 128 Wh; a 1 A fish finder uses about 12 W, so about 10 hours. Check your unit's manual for its current draw; we list common ones on this page.
Can I run my fish finder off my trolling motor battery?
You can, with a fuse, and on a kayak it saves weight. Many bass anglers use a separate electronics battery so motor noise doesn't show up on the sonar and a long day on the trolling motor never shuts off the screens.
Is a 16V battery OK for a fish finder?
Many units are built for it. Garmin lists 10 to 20 V for its STRIKER series, Humminbird 10 to 20 V for MEGA Live, and LiveScope Plus takes 10 to 32 V. Check your unit's input range before buying, and use a charger with a 16 V lithium setting.
What battery is best for ice fishing electronics?
A lithium with low-temperature charge protection. It runs fine in the cold but must not be charged below 32°F, so charge it indoors or in the truck. Redodo's 16V 30Ah pauses charging below 32°F and keeps running down to -4°F.
Runtimes are estimates from published current draw. Prices and specs are copied from makers' US websites on the dates shown and change often. Redodo and Bluetti links are sponsored; Dakota Lithium and the fish finder makers are plain links. See our disclaimer.
Sources
- Redodo 16V 30Ah Lithium Fish Finder Battery with Bluetooth product page — checked October 20, 2026
- Redodo 12V 50Ah Bluetooth Battery for Trolling Motors product page — checked October 20, 2026
- Dakota Lithium 12V 10Ah Mini product page — checked October 20, 2026
- Bluetti Elite 30 V2 product page — checked October 19, 2026
- Garmin STRIKER (4 to 9 in) — 1 A, rated current, Garmin manual
- Lowrance HOOK Reveal 5 — 0.9 A, at full backlight, Lowrance spec sheet
- Humminbird HELIX 7 MEGA DI/SI G4N — 0.95 A, Humminbird HELIX manual
- Garmin ECHOMAP UHD2 7x — 1.1 A, typical draw, Garmin manual
- Humminbird HELIX 10 MEGA DI+/SI+ G4N — 2.7 A, Humminbird HELIX manual
- Humminbird MEGA Live (live sonar) — 0.93 A, maximum, Humminbird install guide
- Garmin LiveScope Plus (live sonar) — 1.75 A, 21 W typical, Garmin install guide (21 W / 12 V)
- Battery University BU-410: Charging at high and low temperatures
Keep going
Photo: Jackery Power Station on Unsplash (Unsplash License).