Small 12 Volt power supply to trouble shoot boat electrical system?

[eaglecreeksailor22]

I do not have a functional battery in my boat at this time, will start out next season with a new one. But I want to check the cabin/running lights, what is a small power supply to do this while boat is in dry storage this winter. Thanks.

[Charles Brennan]

Eagle Creek Sailor,
Sounds like a jump start battery pack to me.

Something like this, or similar.
https://www.walmart.com/ip/12V-20000mAh-Portable-Car-Jump-Starter-Booster-Jumper-Engine-Emergency-Charger-Auto-Power-Bank-Battery-Charger/731902325

I have a battery jump pack that I use for my nav lights, when I take my RIB Short Ribs out at night.
It is also used for when my truck battery leaves me on a cold winter morning.

Hope this helps,
Charles Brennan

[eaglecreeksailor22]

I had a jump pack and it croaked, might be time for another one, good idea thanks.

[Wolverine]

I have one of these I use for testing 12 volt systems. It's small, light weight, has lasted over 6 years, and fits easily in a plastic ammo box along with connecting wires.

https://www.amazon.com/Chamberlain-41A6357-1-Replacement-Battery-SigmasTek/dp/B07DLBNPR2/ref=sr_1_3_sspa?crid=3BGIQS04IJDX&dib=eyJ2IjoiMSJ9.oC_600DJYQPqej4FTQpLjULpXpOoM9fbSqeZVuI0u8XeDZOHz1ggrn3jhNuKAb1UfxurTex0pw6hIu52_k8KFOtRT_Jwoo-0YXbK5tcF7nerUaVcM8JfXSsRuIEJQJvK-g3q7vlQENvHuuCIea06czuJwWPWgQbVYtHf6Sx30DG6glp4Gj_Fky3L2Du7D5elMn0Qecv9F432bR098wWbBg.PPiKoGjUpc88L-TuAbHP-3uY6QEfwVzSadNUubmV-0Q&dib_tag=se&keywords=12+volt+battery&qid=1725298191&sprefix=12+volt%2Caps%2C148&sr=8-3-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&psc=1

[tjspiel]

Eagle Creek Sailor,
Sounds like a jump start battery pack to me.

Something like this, or similar.
https://www.walmart.com/ip/12V-20000mAh-Portable-Car-Jump-Starter-Booster-Jumper-Engine-Emergency-Charger-Auto-Power-Bank-Battery-Charger/731902325

I have a battery jump pack that I use for my nav lights, when I take my RIB Short Ribs out at night.
It is also used for when my truck battery leaves me on a cold winter morning.

Hope this helps,
Charles Brennan

We have one for each car and I use them for all kinds of things. Once I even used one to jump start a car.

I also have an old 12 volt battery from a moped that's pretty compact and works well enough for testing.

[Riggerdood]

We've got one of these. Won it in the holiday boat parade a few years ago. One of the questions they asked during the prize giveaway was how many boats were there, and our 8 year old daughter had counted them, making sure to include ours. And this was the prize!

You cannot view this attachment.

Really though, any power pack that has a 12 volt output could be used for testing.

[eaglecreeksailor22]

Thanks all, just looking for something small and inexpensive. Might be a one time use.