These 3 things will ease your worries, 12volt batteries with a good inverter & tender will work perfectly! Battery Tender Plus 12V Battery Charger and Maintainer: 1.25 AMP Powersport Battery Charger and Maintainer for Motorcycles, ATVs, UTVs - Smart 12 Volt Automatic Float Charger - 021-0128 https://www.amazon.com/dp/B00068XCQU/ref=cm_sw_r_apan_glt_fabc_ZXBHNN9DP4G9CF0ET9AK?_encoding=UTF8&psc=1
BESTEK 2000W Power Inverter 3 AC Outlets DC 12V to 110V AC Car Power Converter for Camping Outdoor Power Supply ETL Listed https://www.amazon.com/dp/B00T93K9KU/ref=cm_sw_r_apan_glt_fabc_W7ZW4ZBMQAJ8FHDCTD60?_encoding=UTF8&psc=1
2 Batteries Weize 12V 9AH Rechargeable SLA Battery for Razor e200 / e200s / e225 / e300,APC UPS Computer Backup Power (BX1300LCD), APC Back-UPS NS 1250, 2 Pack https://www.amazon.com/dp/B07WRXR223/ref=cm_sw_r_apan_glt_fabc_E2TG3DAS5NH569R333S4
Nah it's just a standard 12V battery. You don't need a fancy tender. Anything that connects to your connector will work. And all the ones I've seen come with the pigtail so you can yank yours and install it.
I like this one because it has a few more amps for quicker charging if I'm in more of a hurry:
https://www.amazon.com/Battery-Tender-021-0128-Maintain-Damaging/dp/B00068XCQU
But any tender will do.
I'm using this one: https://www.amazon.com/gp/product/B00068XCQU/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
No bells, whistles, doodads, or whathasits. Just does what I need it to.
The batteries are SO small, not a lotta CCA. Hop on Amazon and get yourself a battery tender.
https://www.amazon.com/gp/aw/d/B00068XCQU?psc=1&ref=ppx_pop_mob_b_asin_title
This is the one I use, it has a little pigtail that you can actually attach to the battery, mine sticks out underneath my seat, roll it In the garage, plug it in and you’re good. Don’t even have to pull the seat off
https://www.amazon.com/gp/aw/d/B00068XCQU
Find it cheaper somewhere else though, this should be more like $50.