This isn't quite enough to fully charge a deep cycle battery. On the other hand, it isn't high enough to immediately cause overcharge, but it does extract its toll. Temperature Compensation Proper voltage regulation is only part of the charge characteristic required by a battery. Temperature compensation over a wide range is a must-have . At low temperatures, increased internal resistance and reduced chemical activity require a higher charging voltage.
High temperatures have the opposite effect.
To prevent thermal runaway, applied voltage must be decreased. Thermal runaway is a problem seen with fast charge regulators which don't use temperature sensing at the battery. Since it takes a high voltage to fully charge a battery, and a lower voltage to maintain it after a full charge, multi-step regulators and chargers have come into existence. Such devices are a vast improvement over conventional single setpoint regulators. Ultimate performance is offered by regulators which sense battery temperature and compensate output as a result.