Anti-gravity here been 5 years or so carrying, used once.

 

I've got 3, 1 for each car and 1 for the bike. I charge them every spring only because that's when it's convenient.
But they'll hold a charge for a couple of years depending on usage.

 

What brands do you have ?

 

I use the beefy Earth X cable. https://earthxbatteries.com/shop/ear...-connect-cable

I can jump the bike, run heated gear for the Mrs. and if you get this little doo-hickey, you can USB charge your phone.

Of course you can USB charge your phone off the jump pack battery too.

It always amazes me that if you can think of something, you can find it online!

 

I have one myself, hope to never use it.

rk classic.

 

I purchased a HD booster pack (a NOCO GB40 with HD brand) and the NOCO GBC 009 Harness. The harness is an 8 ga. pigtail that is connected to the battery, remove the lightweight pigtail, and this NOCO plugs right into the jumper pack. Do not have to use the clamps. This harness comes with an adapter that the smart tender plugs into. When on group rides, the alligator clamps go with me in the little bag, when ever I'm out solo the jumper pack is with me.

 

I've had one on my bike for about two years

I did a practice run on my own bike to make sure it worked and that I could make it happen from start to finish.....turns out you need tools to get to the battery....that's just stupid imho, but that's a lot of HD stuff

my wife and I passed a car in a parking lot and I could hear the tell tale signs of a near dead battery, was the first time I actually needed it, I was super happy to offer a jump, she doubted the jumper would work, took about 2 mins to get her battery up to snuff and ready to start

 

I have the micro jump starters I carry in all my vehicles now, about the size of a deck of cards. I have jump started several autos for people with them, hard to believe how well they work.

I carried one like that on the bike a couple years but a few months ago one of my grandkids got me one of these . Maybe not that exact one but close. It looks like an old 2 D cell battery flashlight but is a good LED light with a USB port and the short plug-in cables plus a 12volt lighter/ power port socket you can plug in to it. I've been using it camping to keep everything charged. Works great so far.

 

Wow TroubleHead Fred! That one is so small! And it looks like it takes the universal jump connectors so you can use the EarthX wire harness.

Like I said, if you can think of it, you can find it online!