You can use 6 V 7Amp battery for your bait tank. At least I'm using 6V with 500 gal pump.
On 6V it has slower flow, but good enough for macks, even sardines. When it's all clean and buzzin along.
Battery is smaller, lighter.
Pump works much quieter.
Do keep an eye on your intake to stay clean, eel grass can clog inside on that valve and kill the water flow.
Which then kills your bait.
