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Winter storage with battery tender

True but Chevguy was saying that running an extension cord was not practical for him. Using a standalone battery source and inverter is just an option.
There are ways to use the extension cord with out worrying about getting plugs wet if this is what he is concerned about. Later RJD
 
If you have Ryobi 18V tools and batteries like I do, a small inverter will help power the trickle charger without running an extension cord. Jackery also make a small portable battery backup unit (I have the 2000W plus) that can be used. Works fine on the boat with three batteries to maintain. Just recharge it periodically when it runs down.
The parasitic draw from components would bring down even the largest 8Ah Ryobi tool batteries pretty quickly (less than a week I bet). A typical car battery already has 50Ah so an extra 8 will not add a lot of extra capacity. AT least beding a tool battery you can take them home and charge them but that's not much of a fix and forget solution but is a solution. Ideally you want something like solar to continuously keep up. Feed any daytime extra power into some battery and should last indefinitely given enough solar panel area/efficiency. Google around for a solar battery tender and something you like should pop up much cheaper than Ryobi tool batteries. There's also a lot of external battery power boxes on every YouTube channel and you can likely find something you can sit in your car or near it (theft risk) to power whatever other type of tender you want.

These cars have a small battery in the trunk. I find it hard to believe that is the actual battery for the starter, I had assumed it was a supplemental for auxilliary stuff... I can't find anything else in the manual so the battery in these cars might only be 20-25Ah capacity or some trivial little thing.

Sounds like they expect about 30 days to dead based on the manual:

STARTING AND OPERATING 141
...
EXTENDED PARK STARTING
NOTE:
Extended Park condition occurs when the vehicle has
not been started or driven for at least 30 days.
1. Install a battery charger or jumper cables to the 12
Volt battery to ensure a full battery charge during
the crank cycle.
2. Press and hold the brake pedal while pushing the
Start button once.
3. If the engine fails to start within 10 seconds, wait
10 to 15 seconds to allow the starter to cool, then
repeat the Extended Park Starting procedure.
4. If the engine fails to start after eight attempts,
allow the starter to cool for at least 10 minutes,
then repeat the Extended Park Starting procedure.

Maybe some day I'll get an ammeter on the battery and see what the parasitic draw looks like and what you'd need to size up for a solar battery tender.

Dart
 
Was not meant to be a 24/7 solution but something to do every couple of weeks or before you go to start it after an extended period of time. I have 2 lead acid starter batteries and an AGM battery in the boat. Once a month when stored for the winter without a 110 power source available, I connect up the Jackery, have a couple of beers next door at the Tiki bar, and the NOCO charger/conditioner servicing all three batteries does its thing.
 
There is a battery storage mode in the menu which appears to mostly shut the car down. I thought it was a charge state reading like I can get on my 16. That PID doesn’t work for the 26 though. I’ll check out the solar trickle chargers as well. Not totally convinced about that supercapacitor. Here’s a decent solar charger, lots of really cheap ones on Amazon https://www.amazon.com/dp/B0DHD3GRSF?tag=chargersixpack-20
 
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If you have Ryobi 18V tools and batteries like I do, a small inverter will help power the trickle charger without running an extension cord. Jackery also make a small portable battery backup unit (I have the 2000W plus) that can be used. Works fine on the boat with three batteries to maintain. Just recharge it periodically when it runs down.

I got one of those in the spring and used it all summer for my portable cooler! Works great and lasted for hours.
 
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