While we highly recommend using our onboard marine chargers, they're other compatible lithium chargers out there that will work with an ABYSS. They include; the Stealth I Charging , and Power Pole CHARGE. Our batteries have been tested and work flawlessly with both charging systems with no issues. We only recommend using our charger because it is programmed and specifically designed to charge our batteries. Our marine lithium battery chargers come equipped with built in safety features along with a pulse wake-up mode function that automatically restarts your battery if it has been fully discharged and in protection mode. All these features built into our waterproof chargers are designed to make your experience using our products that much easier and extend your battery life cycle. The choice is yours.