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The real measure is a complex combination of voltage, current energy, and rate.

Volatage is an indication of electrical pressure.

Current, or amps, is an indication of electrical flow.

An electrical pulse (rate) travels down the fence line. It’s best to choose a low impedence energizer that delivers a safe and effective shock.

A Stored Energy Number System (Joules) gives the best indication of the energizer’s ability to handle fence load and maintain an effective shock.

A battery powered energizer needs a constant current from a battery. If not re-charged, the battery will eventually become completely discharged and the energizer will stop. The amount of current required by an energizer increases with the size of the energizer. The amount of charge stored by the battery is measured in Amp-hours (Ah) and increases with the size of the battery. A battery should be chosen which is designed for regular charge and discharge cycles, and for discharging most of its capacity without damage.

For small enclosures, D cell batteries can be used for compact enerizers, but more powerful energizers for larger enclosures, deep cycle batteries are recommended.

Deep cycle batteries are designed to be discharged and re-charged without damage, whereas, automotive batteries are not designed for multiple re-chargings.

Batteries should be placed on a level surface and be protected against extremes of temperature. They should not be in direct contact with cold surface such as the ground. Placing suitable insulating material under the batteries, or placing them in a battery box and burying the box will also help increase their service life. Ensure that the battery has adequate ventilation to allow gases to escape.