Jaro-BT20.12: The JARO-BT20.12 is a nice entry-level model for electric motors up to 30lbs or as a service battery for your 12V devices. This model battery is also included in the JARO BT20.12 Portable, the case with battery.
The battery has a charge cycle of +/- 2000, 5 times as much as a lead-acid battery.
The battery weighs only 3.2 kg and is also available as a portable case. You can roughly compare the JARO-BT20.12 with a 12V40Ah 28kg lead-acid battery.