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| Fig 1: SLA Battery, Power Lead and Voltmeter. |
SLA batteries are best float charged while they are working as in a vehicle system where the alternator is continuously charging the vehicle battery when the engine is running. If the battery is used for long periods without charging it is important that it does not drop much below about 50% (6.03 volts) (see the chart below) of its charge state otherwise the battery may be permanently damaged.
This voltmeter provides an easy means for measuring the voltage when visiting cameras in the field.
Figure 4 shows the back of the meter inside the box and to the left is the power socket. The meter is powered by the battery under test so there are just the
