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Product Information
The SeaLife SL9831 is a rechargeable 7.4V lithium-ion battery built for SeaLife Sea Dragon photo/video dive lights rated under 4000 lumens, delivering a typical 3500mAh (25Wh) charge with marine-grade gold and nickel-plated contacts for reliable power underwater.
Who it is for
This battery is for divers and underwater photographers or videographers who already own a compatible Sea Dragon light and want a genuine SeaLife replacement or spare cell to extend bottom time on multi-dive days, travel trips, or back-to-back video shoots without waiting on a recharge.
Key details
- Voltage: 7.4V typical (7.2V rated)
- Capacity: 3500mAh typical (3400mAh rated)
- Energy: 25Wh typical (24.48Wh rated)
- Dimensions: 3.0 x 1.5 x 0.8 inches (75 x 39 x 21 mm)
- Weight: 3.8 ounces (109 grams)
- Integrated protective circuit for safety
- Marine-grade gold and nickel-plated contacts (30 µin gold, 50 µin nickel)
Compatibility and sizing
The SL9831 fits all Sea Dragon photo/video lights rated under 4000 lumens, including the Fluoro-Dual Beam, 1200F, 1500F, 2000F, 2100SF, 2300F Auto, 2500F, 3000SF Pro, and 3000F Auto. Charging requires the Sea Dragon charging tray (SL98311) and AC power adapter (SL98312), both sold separately.
What's in the box
- Rechargeable lithium-ion battery (SL9831)
- Protective cover/cap
DiveCatalog.com is an authorized SeaLife dealer and a dive shop in Irvine, California, serving divers since 2003. Call or chat with us at 888-701-4017 if you need help matching this battery to your Sea Dragon light or charging setup.
- Genuine SeaLife battery: Rechargeable lithium-ion cell, SKU SL9831, built for Sea Dragon photo/video lights.
- Typical output: 7.4V, 3500mAh, 25Wh for extended light run time.
- Rated output: 7.2V, 3400mAh, 24.48Wh per manufacturer rating.
- Marine-grade contacts: Gold and nickel-plated battery contacts (30 µin gold, 50 µin nickel).
- Built-in safety circuit: Integrated protective circuit for safety.
- Compact size: Measures 3.0 x 1.5 x 0.8 inches and weighs 3.8 ounces.
- Broad compatibility: Fits all Sea Dragon lights under 4000 lumens, including the Fluoro-Dual Beam, 1200F, 1500F, 2000F, 2100SF, 2300F Auto, 2500F, 3000SF Pro, and 3000F Auto.
- Protective cap included: Comes with a cover/cap to protect contacts during storage and travel.
- Charger sold separately: Requires the Sea Dragon charging tray SL98311 and AC power adapter SL98312.
- Shipping note: Air shipping is not available for this battery.
| SKU | SL9831 |
| Voltage (typical) | 7.4V |
| Voltage (rated) | 7.2V |
| Capacity (typical) | 3500mAh |
| Capacity (rated) | 3400mAh |
| Energy (typical) | 25Wh |
| Energy (rated) | 24.48Wh |
| Dimensions | 3.0 x 1.5 x 0.8 inches (75 x 39 x 21 mm) |
| Weight | 3.8 ounces (109 grams) |
| Packaged dimensions | 3.3 x 1.9 x 1.1 inches |
| Packaged weight | 4 ounces (113 grams) |
| Battery contacts | Marine-grade gold and nickel-plated (30 µin gold, 50 µin nickel) |
| Country of origin | Made in China |
| Warranty | 1-year limited warranty |
- Rechargeable lithium-ion battery (SL9831)
- Protective cover/cap
⚠️ WARNING: This product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.
Frequently Asked Questions
Which Sea Dragon lights work with the SL9831 battery?
The SL9831 fits all Sea Dragon photo/video lights under 4000 lumens, including Fluoro-Dual Beam, 1200F, 1500F, 2000F, 2100SF, 2300F Auto, 2500F, 3000SF Pro, 3000F Auto.
Do I need a separate charger for this battery?
Yes. The SL9831 battery requires the Sea Dragon charging tray (SL98311) and the Sea Dragon AC power adapter (SL98312) to recharge. Both accessories are sold separately and are not included with the battery.
Can this lithium-ion battery be shipped by air?
No. SeaLife states that air shipping is not available for this battery.
What is the difference between the battery's rated and typical specs?
SeaLife publishes two figures: a rated output of 7.2V, 3400mAh, 24.48Wh, and a typical output of 7.4V, 3500mAh, 25Wh.
