I use a Victron 12V 100AH Lithium Smart Battery. Only a Raspberry Pi is connected (consumption approximately 575 mAh). The voltage was 14.2V and the charging status is 100%. After a few days, the charging status is still 100%, but the voltage has dropped to 11.2V and gives error message A-SL11: 'alarm too low voltage'. How is this possible while the battery is still 100% charged?