When setting up an electric fence in an area without mains power (230V), you’ll need a battery-powered energiser. But what’s the difference between a 9V battery and a 12V rechargeable battery, and which one is best suited for your fencing needs? Choosing the right battery for your energiser is essential for performance, longevity, and cost-effectiveness. The first step is to assess which type of energiser you have or need to buy. Below, we break down the key differences in energiser batteries to help you make the best decision.
Key Differences Between 9V and 12V Batteries
Feature |
9V Battery |
12V Battery (rechargeable battery) |
Rechargeable? |
✖ No – Single-use |
✓ Yes – Can be recharged |
Ready to Use? |
✓ Yes – No charging needed |
✖ No – Needs initial charge |
Battery Lifespan |
⏳ Shorter – Disposable |
⏳ Longer – Reusable |
Best for… |
Short-term use, portable fences, low-maintenance setups |
Long-term use, high-power fences, cost-efficiency |
Battery Cost Over Time |
Higher (needs frequent replacement) |
Lower (one-time investment + recharging) |
Storage Inside Energiser? |
✓ Often fits inside the unit |
✖ Usually placed externally |
Battery Maintenance |
None – Replace when empty |
Regular charging, prevent deep discharge |
9V Batteries – Simple & Convenient
9V batteries are ready to use straight out of the box, requiring no charging before installation. This makes them a hassle-free option for those who need a quick and easy power source for their electric fence.
They are also compact and lightweight, allowing them to fit neatly inside compatible energisers. Their small size makes them ideal for portable or temporary fencing setups, particularly in areas with low animal pressure where a high-powered solution isn't necessary.
The main downside of 9V batteries is that they cannot be recharged. Once depleted, they must be replaced, which can make them less cost-effective in the long run compared to rechargeable options.
A useful tip when using 9V batteries is to keep a spare on hand. This ensures your electric fence remains operational without unexpected downtime when a battery runs out. We also offer battery duopacks, ideal for keeping a spare around.
Alkaline Optimum Performance 9V/160Ah
|
Powerpack Battery Alkaline - 9V/ 160Ah
|
![]() |
![]() |
12V Batteries (rechargeable batteries) – Long-Term & Cost-Effective
12V batteries are rechargeable, meaning they can be used multiple times with a special charger. Unlike 9V batteries, they provide a long-term power solution, making them a preferred choice for larger fences or high-powered energisers.
These batteries also offer higher power and capacity, allowing them to support more extensive fencing setups and maintain consistent performance over time. Since they can be recharged, they are also a more sustainable option, reducing waste and ongoing costs compared to disposable batteries.
However, regular maintenance is required. A 12V battery must be recharged before it runs completely empty to avoid damage and extend its lifespan. If left uncharged for too long, the battery may degrade, affecting its ability to hold a charge.
A useful tip is to check your energiser’s battery level indicator if it has one. For example, Gallagher energisers feature an indicator that signals when the battery is running low, allowing you to recharge it in time and avoid interruptions in your fence’s power supply.
Electric Fence Battery Pro 12V/80Ah
|
Battery 12V/100Ah Premium Turbo AGM
|
![]() |
![]() |
Find the Perfect Battery for Your Gallagher Energiser!
Choosing the right battery for your Gallagher energizer doesn’t have to be tricky! Whether you're powering a portable setup or a longer-lasting system, this handy guide shows you which batteries work best with each model. From 9V options that keep things light and easy to 12V batteries that go the distance. Let’s make sure you’re always charged up and ready to go!
Battery Type |
BA20 |
BA40 |
B100 |
B200 |
B300 |
9V 55Ah |
✓ |
✓ |
✖ |
✖ |
✖ |
9V 120Ah |
✓ |
✓ |
✖ |
✖ |
✖ |
9V 160Ah |
✓ |
✓ |
✖ |
✖ |
✖ |
9v 175Ah |
✓ |
✓ |
✓ |
✖ |
✖ |
9V 210Ah |
✓ |
✓ |
✓ |
✖ |
✖ |
12V 65Ah |
✓ |
✓ |
✓ |
✓ |
✓ |
12V 85Ah |
✓ |
✓ |
✓ |
✓ |
✓ |
The BA20 and BA40 models are compatible with 9V batteries, the B100 is designed for 9V and 12V batteries while B200 and B300 models are designed for 12V batteries. It's important to note that the B100 model requires a minimum of a 25Ah battery, the B200 requires at least a 50Ah battery, and the B300 requires a minimum of a 75Ah battery.
Final Thoughts – Which One Should You Choose?
Choose a 9V battery if you need a quick, hassle-free solution for a temporary or low-power fence. Choose a 12V rechargeable battery if you want long-term use, higher power, and lower long-term costs. No matter which option you choose, selecting the right capacity (Ah) ensures your fence runs efficiently!
Need Help Choosing the Right Battery?
Check out our full range of 9V and 12V batteries or contact us for expert advice!