Sealed Gel Cell Batteries

Gel cell batteries use sealed cells for versatile, low-maintenance power storage. Like AGM batteries, sealed gel cell batteries can handle long periods of inactivity since they don't need regular discharging, watering, or ventilation checks. Gel cell batteries tend to be a bit more robust and longer-lived than AGMs, and are an excellent choice for part-time off-grid cabins or emergency backup systems where expected use is intermittent.

"In many ways, batteries are safer than traditional AC power. It's not impossible, but it's pretty difficult to shock yourself with the low-voltage direct current (DC) in the 12- or 24-volt battery systems we commonly use."

Solar Living Sourcebook 14th Edition
Chapter 4: From Panel to Plug

Sealed Gel Cell Batteries from Real Goods