I have never heard of one of those, since that is not what a trickle charger is really meant for i doubt they even make one. As a work around you could just buy a car battery, charge it up wherever and then cable it to the bike battery (same way you would the trickle charger) and let that big battery keep the smaller battery topped off.

 

I don't really think getting the battery on a trickle charger each night will make much difference in the life of the battery. About the only exception would be if you only ride for 10 to 15 minutes each time you start the bike. It usually takes a good 20 minutes to for the bike electric system to put the full charge back in the battery to maintain peak efficiency. I have never worried about putting the battery on a tender when on a bike trip because I am riding each day for fairly long periods of time. If you are worried about getting the maximum life from your AGM bike battery the best you can do is a charger/maintainer that is specifically designed for these types of batteries.

Here is one that I am fond of. Designed for AGM batteries, de-sulfates, and has a temp compensator on it. Ideal for bikes that sit for longer periods of time. Dean

Amazon.com: BatteryMINDer 2012-AGM - AGM Batteries Only - 12 Volt-2 Amp Battery Charger, Battery Maintainer, and Battery Desulfator for Odyssey, Optima * AGM Lead-Acid Batteries : Automotive

Buy BatteryMINDer 2012-AGM - AGM Batteries Only - 12 Volt-2 Amp Battery Charger, Battery Maintainer, and Battery Desulfator for Odyssey, Optima * AGM Lead-Acid Batteries: Battery Chargers - Amazon.com ✓ FREE DELIVERY possible on eligible purchases

www.amazon.com

 

In theory, you should be able to use a NOCO jump pack's USB out, plugged into the saddlebag or trunk 12V outlet, if your bike is equipped with one.

You could also attach a USB to SAE connector to a SAE pigtail that's already on your bike. Again, using the USB out on the NOCO.

And again, In theory.

 

USB protocol is only 5V power not 12V (except the newer PD which is 48V), so that may not be a good option as it would only keep the battery up to 5V. A 12V battery is considered fully drained at 10.5V.

 

Where will the bike be located? Outside? Or in a garage or shed with no power? The issue with both of these options is they could be stolen … if it’s just sitting outside …

What you’re looking for is a DC to DC charger … it uses a larger battery to charge your motorcycle battery …

Amazon.com: TecMATE Optimate DC to DC, TM-500v3, 6-Step 12V/12.8V 2A Sealed Battery Saving Charger & Maintainer : Automotive

Buy TecMATE Optimate DC to DC, TM-500v3, 6-Step 12V/12.8V 2A Sealed Battery Saving Charger & Maintainer: Battery Chargers - Amazon.com ✓ FREE DELIVERY possible on eligible purchases

a.co

Or in the alternative… a portable power station … That you could plug a standard AC maintainer into. …

 

Wow, good to see expensive options for something that isn’t really needed,lol.
Charlie

 

Here you are:
CTEK CS Free Charger – Product Review | Car & Classic Magazine