A rugged, efficient battery charger for remote pastures and predator control, with a long lightning covered warranty.
Amazon $133.08The Parmak Magnum 12 rates 4.9 among battery and solar electric fence energizers; the Gallagher M560 rates 3.6 among plug-in ones. The Parmak Magnum 12 costs $186.91 less ($133.08 vs $319.99).

A strong plug-in charger for large pastures up to about 400 acres, from a maker that publishes real output energy.
Amazon $319.99Prices were last checked November 2, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Scores side by side
These two sit in different power source classes (battery and solar and plug-in), and each is scored against the reference points for its own class, so a rating says how well each does among its own power source peers. How we rank explains each factor.
| Factor weight | Parmak Magnum 12 | Gallagher M560 |
|---|---|---|
| Overall rating | 4.9/5 | 3.6/5 |
| Value 35% | 98 $42.93 per joule ($133.08, 3.1 J output) | 52 $80 per joule ($319.99, 4 J output) |
| Output 25% | 94 3.1 J output | 69 4 J output |
| Warranty 25% | 100 3-year warranty | 100 3-year warranty |
| Lightning cover 15% | 100 warranty covers lightning damage | 0 lightning damage not covered |
Specifications
| Parmak Magnum 12 | Gallagher M560 | |
|---|---|---|
| Output | ||
| Power | Battery | Plug-in (110 V) |
| Output energy | 3.1 J | 4 J |
| Stored energy | - | 5.6 J |
| Rated fence length | 30 miles | 75 miles |
| Rated area | - | 400 acres |
| Peak voltage | 13.5 kV | - |
| Low impedance | Yes | - |
| Build | ||
| Battery | 12 V | - |
| Lightning cover | Yes | No |
| Warranty | 3 years | 3 years |