Xylem WS705 IMPROVED COMPOSITE/DISCRETE WATER SAMPLER - Manual (Page 16)

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Appendix B: Battery Life
While battery life depends on several factors such as charge, condition and temperature; it
can generally be assumed that the sampler can deployed in the field for 3 months waiting to
be triggered, while still retaining enough charge to run a single pump for one hour (about 10
gallons).
The battery should generally be charged at least once per month and the voltage should not
be allowed to fall below 11 volts. The internal charge controller will prevent the
overcharging of the battery if the charger is left connected all the time.
Appendix C: Input and Output Connections