Battery Storage/Tender

ja308601

Member
Jan 1, 2019
99
Lake Erie
Boat Info
2007 290 DA
Kohler 5kw, Raymarine Hybrid Touch
Engines
5.0L Mercruisers w/Bravo III Drives
The boat is coming out of the water tomorrow and I am bringing the batteries home with me. What chargers/tenders are folks using/recommending?

TIA!
 
The boat is coming out of the water tomorrow and I am bringing the batteries home with me. What chargers/tenders are folks using/recommending?

TIA!

If your batteries are in good shape and not connected to anything you really shouldn't need a "tender" for the winter. Make sure they are fully charged when you take them off the boat and maybe hook them up to a standard charger in the spring before you put 'em back in.

My experience has been that tenders are more useful when you leave the batteries in something (like a car) for long term storage where some systems are still drawing small amounts of juice.
 
I leave mine on board, disconnected and not on a tender. In the spring when I put the converter back on, it never has to charge very long so I don't think they lose much charge over winter.
 
I ended up with a spare ProNautic charger (20amp) that I use for winter layup. I take the batteries home, and wire them up (see excerpt below). I'm only on year 2 for these batteries, so it's too early to tell if they benefits are truly there. At the very least, they are more than ready for spring. If I didn't have the spare ProNautic, I would throw them on the regular automotive smart-charger half way through the winter, and again before launching in the spring. Have to factor in how many batteries you have, and how much you paid for them.

Stage 5 - Storage Recondition: During this stage the Pro Series will enter into its once a month storage recondition mode. The green Storage Recondition LED will have a fade in and out pulse indicating that while your batteries / boat are in storage, the Pro Series is reconditioning all batteries for up to 3 hours once a month to extend battery life and provide maximum reserve power performance on the water
 
I’m a big fan of the “Battery Tender” brand.
I’ve got a couple in my garage that I use for my Corvette and GTO, been using them for years and they’re great.
 
I have used the Battery Tender brand with good success. I am currently using a CTEK on my 991.1. I remove my Waverunner battery during the winter and put on the trickle charge periodically. May not be needed but it doesn’t hurt.
 

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