Seems like it's a fairly run-of-the-mill charger/booster pack and equipped with a standard LA (Lead Acid) battery. That means it will require more attention to state of charge and its rate of free-air discharge will be a bit greater. It will last a few years at least but I wouldn't say more than 3 or 4 w/ a flooded acid battery onboard. If it's UL rated, there will be an "E" number somewhere on the identification label that might offer more insight as to whom the real manufacturer is in China. CAT doesn't have any interest in battery power manufacturing over there, so it's a certainty that they've outsourced it to a dedicated electrical/electronics factory (Xantrex, et al).
From the operation manual:
"CHARGING/RECHARGING Lead-acid batteries require routine maintenance to ensure a full charge and long battery life. All batteries lose energy from self-discharge over time and more rapidly at higher temperatures. Therefore, batteries need periodic charging to replace energy lost through self-discharge. When the unit is not in frequent use, manufacturer recommends the battery be recharged at least every 30 days.
Notes:This unit is delivered in a partially charged state – you must fully charge it upon purchase and before using it for the first time for a full 40 hours or until the green LED Battery Status Indicator lights solid. Recharging the battery after each use will prolong battery life; frequent heavy discharges between recharges and/or overcharging will reduce battery life. Make sure all other unit functions are turned off during recharging, as this can slow the recharging process.In some rare cases, if the battery is overly discharged and the green LED lights immediately when the charger is plugged in, this indicates the battery is at a high impedance stage. If this occurs, recharge the unit for a period of 24-48 hours before use"