Introduction
The MK Battery ES17-12S is a high-quality Valve Regulated Lead Acid (VRLA) battery designed for reliable performance and extended cycle life. This battery is sealed and 100% maintenance-free, ensuring it will not leak or spill. It is suitable for a wide range of applications requiring dependable 12V power.
This manual provides important information regarding the specifications, safe handling, installation, operation, and maintenance of your ES17-12S battery. Please read it thoroughly before use.
Product Overview
The image below shows the MK Battery ES17-12S, highlighting its compact design and terminal type.

Image: MK Battery ES17-12S Sealed Lead-Acid Battery. This image displays the top and side view of the battery, showing the branding, model number, and warning labels.
Safety Information
WARNING: This product contains lead, a chemical known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.
- This is a non-spillable battery, approved for air transport by I.C.A.O., I.M.D.G., I.A.T.A., and D.O.T. (Meets requirements of DOT CFR 173.159 (d) provision A67).
- Recycling: This battery must be recycled. Do not dispose of in household waste.
- Danger/Poison: Batteries contain sulfuric acid. Avoid contact with skin, eyes, or clothing. In case of contact, flush with water immediately and seek medical attention.
- Explosion Hazard: Do not short-circuit battery terminals. Keep sparks, flames, and smoking materials away from the battery.
- Ventilation: Ensure adequate ventilation when charging to prevent accumulation of explosive gases.
- Handling: Always lift the battery using appropriate lifting techniques or equipment due to its weight.
Specifications
| Feature | Detail |
|---|---|
| Model Number | ES17-12S |
| Nominal Voltage | 12V |
| Nominal Capacity (20 hour rate) | 18Ah (0.9A to 10.50V) |
| Nominal Capacity (10 hour rate) | 17.1Ah (1.71A to 10.50V) |
| Nominal Capacity (5 hour rate) | 15.3Ah (3.06A to 10.20V) |
| Nominal Capacity (1C rate) | 9.6Ah (18A to 9.60V) |
| Nominal Capacity (3C rate) | 6.3Ah (54A to 9.60V) |
| Weight | Approx. 12.89 lbs (5.86 kg) |
| Internal Resistance (at 1KHz) | Approx. 12 mΩ |
| Maximum Discharge Current (5 seconds) | 270A |
| Operating Temperature Range (Charge) | -15°C (5°F) to 40°C (104°F) |
| Operating Temperature Range (Discharge) | -15°C (5°F) to 50°C (122°F) |
| Operating Temperature Range (Storage) | -15°C (5°F) to 40°C (104°F) |
| Case Material | ABS (Option: UL94 HB Flame Retardant Case Material) |
| Terminal Type | F2 (Faston Tab 250) |
| Product Dimensions (L x W x H) | 7.13 x 2.99 x 6.57 inches (181 x 76 x 167 mm) |
| Battery Cell Composition | Lead Acid |
| Recommended Uses | Electric Vehicles, Emergency Lighting, Motorcycles, Alarm Panels, Bug Sprayers, Car Audio, Chair Lifts, Consumer Electronics, Elevators, Engine Starters, Exit Lights, Game Feeders, Garage Door Openers, Gate Operators, Golf Caddys, Home Medical Equipment, Lawn and Garden Equipment, Medical Mobility, Patient Lifts, Portable Speakers and Tools, Power Sports, Security Systems, Stair Lifts, Solar, Toys, Trailer Safety Brakes, UPS / Standby Power, Van Lifts and Wind Machines. |
Dimensional Diagram
The battery features dimensions of approximately 7.13 inches (181mm) in length, 2.99 inches (76mm) in width, and 6.57 inches (167mm) in height, including terminals. The terminals are F2 (Faston Tab 250) type.
Discharge Characteristics
A discharge time versus discharge current graph (at 25°C) illustrates the battery's performance under various load conditions. This graph shows how the battery voltage decreases over time for different constant current discharge rates (e.g., 0.8A, 1.71A, 5.4A, 18A, 54A).
Setup and Installation
- Inspection: Before installation, visually inspect the battery for any signs of damage, cracks, or leaks. Do not install a damaged battery.
- Terminal Type: The ES17-12S battery uses F2 (Faston Tab 250) terminals. Ensure your application's connectors are compatible with this terminal type.
- Polarity: Connect the positive (+) terminal of the battery to the positive lead of your device/system and the negative (-) terminal to the negative lead. Incorrect polarity can cause severe damage to the battery and connected equipment.
- Secure Connection: Ensure all connections are tight and secure to prevent arcing and power loss. Do not overtighten.
- Ventilation: Install the battery in a well-ventilated area, even though it is sealed.
- Positioning: The battery can be installed in any orientation except inverted (upside down).
Operating Instructions
Charging
Proper charging is crucial for battery life and performance. Use a charger specifically designed for sealed lead-acid batteries.
- Cycle Use (Deep Cycle Applications):
- Charging Voltage: 14.4 to 15.0V at 25°C (77°F)
- Temperature Compensation Coefficient: -5.0mv/°C/cell
- Maximum Charging Current: 5.4A
- Standby Use (Float Applications):
- Float Charging Voltage: 13.50 to 13.80V at 25°C (77°F)
- Temperature Compensation Coefficient: -3.0mv/°C/cell
- Operating Temperature Range for Charging: -15°C (5°F) to 40°C (104°F). Charging outside this range may reduce battery life or efficiency.
Discharging
- Operating Temperature Range for Discharging: -15°C (5°F) to 50°C (122°F). Performance may vary outside this range.
- Avoid deep discharges below the recommended voltage levels to prolong battery life. Refer to the discharge curve in the specifications for voltage limits under load.
Maintenance
The MK Battery ES17-12S is a maintenance-free battery, meaning it does not require water additions or electrolyte checks. However, proper care and storage are essential for maximizing its lifespan.
- Cleaning: Keep the battery terminals and case clean and free of dirt or corrosion. Use a damp cloth to wipe down the battery. Do not use solvents.
- Terminal Connections: Periodically check terminal connections for tightness. Loose connections can cause overheating and power loss.
- Storage: If the battery is to be stored for an extended period, ensure it is fully charged before storage. Store in a cool, dry place within the recommended storage temperature range of -15°C (5°F) to 40°C (104°F).
- Charge Retention (Shelf Life at 20°C / 68°F):
- 1 month: 92% capacity retention
- 3 months: 90% capacity retention
- 6 months: 80% capacity retention
Troubleshooting
- Battery Not Holding Charge:
- Verify the charger is functioning correctly and is appropriate for sealed lead-acid batteries.
- Check charging voltage and current settings against specifications.
- Ensure battery terminals are clean and connections are secure.
- Battery may have reached the end of its service life.
- Low Voltage Output:
- Battery may be undercharged; attempt a full charge cycle.
- Check for excessive load on the battery.
- Verify ambient temperature is within the operating range.
- Overheating During Charge:
- Reduce charging current if possible.
- Ensure adequate ventilation around the battery.
- Verify charging voltage is not too high.
If issues persist, contact MK Battery customer support for assistance.
Warranty
Warranty information for the MK Battery ES17-12S is typically provided at the point of purchase or can be obtained directly from MK Battery or your authorized dealer. Please retain your proof of purchase for warranty claims.
Support and Contact Information
For technical support, inquiries, or further assistance, please contact MK Battery:
- Address: 1631 South Sinclair Street, Anaheim, California 92806, USA
- Toll Free: 800-372-9253
- Fax: 714-937-0818
- E-mail: sales@mkbattery.com





