Even after working the whole day on the water, these batteries are not getting hot. Works perfectly in freezing environments as well. True rated constant current charging amps are delivered during its two charge mode while being delivered by an upper, lower, and rear facing heat sink design for the best cooling. Technology for quick, accurate charging controlled by a microprocessor and software. By distributing unused charging amps to any battery or a combination of batteries as needed, 100% of all available charging amps are used. PROS🟢 Two charge modes LED fuel gauge and smart display CONS🔴 Multi-stage charge mode