CTEK Battery Charger - D250SE- 11.5-23V12V Dual input 20A charger with selectable charge voltages The D250SE is a fully automatic, 5 step charger that supplies up to 20A of power to any 12V lead acid or lithium* service battery from 40300Ah. It has selectable charge algorithms for AGM and lithium* batteries and can use power through its dual input from the alternator, solar panel, and wind power. When the service battery is fully charged, the D250SE will automatically redirect maintenance