The 12V DC (direct current) batteries used on NexSens iSIC data loggers can be charged in two ways: online or offline. It will be necessary to decide which is most appropriate for the desired application. The necessary charger type can then be determined.
Online Charging: If it is essential for the iSIC to always remain powered, then online charging is necessary. NexSens offers 10-, 20-, and 30-Watt Solar Power Kits for daytime charging. The NexSens A11 is another option, a 12V float charger used for continuous charging via a standard wall outlet.
Offline Charging: This is an option if it is acceptable to disconnect power from the iSIC before charging the battery. iSIC batteries use a standard voltage, and can therefore be charged using any generic sealed lead acid 12V DC float charger which supplies a charge current between 0.5 and 1.0 A (amps). One such charger is the Power Sonic PSC-12800A. Alternatively, local hardware stores usually carry an equivalent. Be sure to use a sealed lead acid 12V DC float charger which supplies a charge current between 0.5 and 1.0 A.