Knowing how much current your fishfinder and sonar system draws helps you size the right battery for all-day power. Below are the typical amp draws at 12 volts for popular Garmin, Humminbird, and Lowrance units, plus a table for forward-facing sonar modules. See this page for 16 volt amp draw.
Garmin Units – Typical Amp Draw at 12V
| Unit |
Typical Amp Draw |
| Striker 4 |
0.40 A |
| Striker 5 |
0.40 A |
| Striker 7 |
0.55 A |
| Striker 9 |
0.75 A |
| ECHOMAP UHD2 5 |
1.00 A |
| ECHOMAP UHD2 6 |
1.53 A |
| ECHOMAP UHD2 7 |
1.52 A |
| ECHOMAP UHD2 9 |
1.72 A |
| ECHOMAP Ultra 2 10 |
2.30 A |
| ECHOMAP Ultra 2 12 |
2.50 A |
| ECHOMAP Ultra 2 16 |
3.90 A |
| GPSMAP 723/743 |
1.08 A |
| GPSMAP 923/943 |
1.34 A |
| GPSMAP 1223/1243 |
1.67 A |
| GPSMAP 1523/1543 |
2.44 A |
| GPSMAP 1623/1643 |
3.61 A |
| GPSMAP 1022/1042 |
1.90 A |
| GPSMAP 1222/1242 |
2.20 A |
| GPSMAP 8410/8610 |
1.50 A |
| GPSMAP 8412/8612 |
1.30 A |
| GPSMAP 8416/8616 |
1.30 A |
| GPSMAP 8417/8617 |
2.80 A |
| GPSMAP 9010/9210 |
2.43 A |
| GPSMAP 9013/9213 |
3.60 A |
| GPSMAP 9017/9217 |
4.60 A |
| GLS10 (Livescope Box) |
1.75 A |
Humminbird Units – Typical Amp Draw at 12V
| Unit |
Typical Amp Draw |
| XPLORE 9 |
2.20 A |
| XPLORE 10 |
2.20 A |
| XPLORE 12 |
2.40 A |
| APEX 13 |
3.10 A |
| APEX 16 |
4.30 A |
| APEX 19 |
4.40 A |
| HELIX 5 |
0.65 A |
| HELIX 7 |
0.80 A |
| HELIX 9 |
2.40 A |
| HELIX 10 |
2.70 A |
| HELIX 12 |
3.20 A |
| HELIX 15 |
4.00 A |
| MEGA Live |
0.93 A |
| MEGA Live 2 |
1.15 A |
| MEGA Live Target Lock |
1.20 A |
| MEGA 360 |
0.50 A |
| SOLIX 10 |
2.50 A |
| SOLIX 12 |
2.70 A |
| SOLIX 15 |
2.80 A |
Lowrance Units – Typical Amp Draw at 12V
| Unit |
Typical Amp Draw |
| Eagle 5 |
0.28 A |
| Eagle 7 |
0.55 A |
| Eagle 9 |
0.65 A |
| Elite FS 7 |
2.00 A |
| Elite FS 9 |
2.00 A |
| Elite FS 10 |
2.50 A |
| Elite FS 12 |
2.50 A |
| HDS PRO 9 |
2.90 A |
| HDS PRO 10 |
2.90 A |
| HDS PRO 12 |
3.60 A |
| HDS PRO 16 |
4.10 A |
| Hook Reveal 5 |
0.90 A |
| Hook Reveal 7 |
1.25 A |
| Hook Reveal 9 |
1.50 A |
| Elite Ti2 7 |
0.90 A |
| Elite Ti2 9 |
0.90 A |
| Elite Ti2 12 |
1.90 A |
| HDS LIVE 7 |
1.70 A |
| HDS LIVE 9 |
2.00 A |
| HDS LIVE 12 |
2.30 A |
| HDS LIVE 16 |
3.00 A |
| ActiveTarget |
1.50 A |
Forward-Facing Sonar Modules – Typical Draw
| Brand |
Unit |
Amp Draw @ 12V |
| Garmin |
GLS10 Livescope Box |
1.75 A |
| Humminbird |
MEGA Live |
0.93 A |
| Humminbird |
MEGA Live 2 |
1.15 A |
| Humminbird |
MEGA Live Target Lock |
1.20 A |
| Lowrance |
ActiveTarget |
1.50 A |
Quick Takeaway
These amp draws are typical averages at 12 volts, and actual power use will vary slightly depending on screen brightness, sonar mode, and networking.
When sizing your lithium battery, multiply your total amp draw by your expected fishing hours — and add 25–30% for a safe buffer.
