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Battery support on the go: The D250SE is a fully automatic on-board charger that powers 12V lead-acid batteries with current up to 20A or secondary lithium-ion batteries* with a capacity between 40 and 300 Ah. The selectable charging algorithms are designed for 12 V batteries of the type AGM and lithium-ion (*12 V-LiFePO4). Compatible with intelligent alternators: full functionality with all alternator types. Maximized solar energy output: the solar panel controller with maximum power. Point Tracking PT) optimises the available performance. Charging of secondary and starter battery: once the dual battery is fully charged, the D250SE automatically redirects the maintenance charging power to the starter battery. Integrated temperature sensor: allows maximum charging status at any temperature..Safe and easy to use: protected against splash water and dust,and ,and ,and Lock-proof and with protection of vehicle electronics. For added safety, temperature protection for the battery..Protects sensitive devices: unlike less thoughtful chargers, the battery does not need to be disconnected. All CTEK chargers are specially developed to protect electronic systems and do not overcharge or undercharge batteries