You put electrolyte, also known as battery acid, into an AGM (Absorbent Glass Mat) battery. It's crucial not to use water, distilled or otherwise.
AGM batteries are a type of lead-acid battery distinguished by their construction and the material used to contain the electrolyte. Unlike flooded lead-acid batteries, AGM batteries use a fiberglass mat to hold the electrolyte in place, preventing it from sloshing around. This design offers several advantages, including improved performance, durability, and resistance to vibration.
Key Differences from Flooded Lead-Acid Batteries
| Feature | AGM Battery | Flooded Lead-Acid Battery |
|---|---|---|
| Electrolyte | Absorbed in fiberglass mat | Free-flowing liquid |
| Maintenance | Generally maintenance-free | Requires periodic watering |
| Orientation | Can be mounted in various positions | Must be kept upright |
| Vibration Resistance | High | Lower |
Important Considerations
- Activation: New AGM batteries often ship "dry-charged," meaning they are empty of electrolyte. These batteries require activation by carefully filling them with the correct electrolyte solution before their first use. Always follow the manufacturer's instructions precisely.
- Safety: Electrolyte is corrosive. Always wear appropriate safety gear, including gloves and eye protection, when handling it.
- Sealed vs. Vented: While AGM batteries are often referred to as "sealed," they are, more accurately, "valve-regulated." They have a valve that allows gas to escape in case of overcharging, preventing pressure buildup. Never attempt to open a sealed AGM battery.
