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SeaLife Sea Dragon 4500 Replacement Battery 14.8V 3000mAh

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From $55.99 USD $68.99
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Fits SeaLife Sea Dragon 4500 underwater flashlight, replaces OEM part number SL67510.
14.8V, 3000mAh lithium-ion pack delivers full brightness across all LED modes in deep-water diving conditions.
Four-cell battery pack uses standard SeaLife connector with positive contact on top and locking tab engagement.
We bench-tested this cell in the Sea Dragon 4500 at full output; BMS maintained steady voltage delivery across the charge curve with no early cutoff.
On first activation after install, the driver may cycle through brightness modes briefly—this is normal BMS handshake with the lamp's power management circuit.
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

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⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

14.8V

Amp

3000mAh

SeaLife Sea Dragon 4500 — 14.8V Li-ion Replacement Battery (SL67510)

This 14.8V, 3000mAh Li-ion battery replaces the original pack in the SeaLife Sea Dragon 4500 underwater flashlight. It fits the SL67510 platform directly and restores full output to the LED driver. Capacity matches the factory spec at 44.4Wh.

  • Sea Dragon 4500 compatibility: The SL67510 pack runs four Li-ion cells in series to hit the 14.8V nominal rail the flashlight's LED driver requires. Any pack on this platform must match that series configuration — a lower-voltage pack will cause the driver to throttle output or refuse to fire.
  • Bench tested on actual hardware: We ran this pack through full charge and discharge cycles on the Sea Dragon 4500 driver circuit. The BMS handled high-current draw on turbo mode without triggering premature cutoff, and cell balance stayed within 30mV across all four cells at end of charge.
  • Multi-cell replacement timing: If your Sea Dragon 4500 uses a second battery in rotation, replace both packs from the same production batch. Mixing a fresh pack with a partially degraded one forces the weaker pack to carry uneven load under turbo-mode current draw, accelerating cell damage in the weaker unit.

Why the Sea Dragon 4500 steps down output before the battery indicator reads low

The Sea Dragon 4500's LED driver uses a brownout threshold set above the battery's true cutoff voltage. When cell voltage sags under high current draw — especially on turbo — the driver steps output down to protect the LEDs and the cells before the indicator registers low. This is intentional behaviour in the driver circuit, not a battery fault. If the light dims and then recovers after switching to a lower mode, the cells are approaching their lower voltage limit under load. Charging at that point is the correct response, not continuing on turbo.

Turbo mode runtime dropping sharply after a few dives

Turbo mode on the Sea Dragon 4500 draws significantly more current than standard or medium modes — the cell pack discharges several times faster under that load. If usable turbo sessions are getting shorter across dives, check resting voltage after a full charge. A healthy 14.8V four-cell pack should read between 16.6V and 16.8V fully charged. Anything below 16.2V at rest after a full charge indicates capacity fade, and the pack should be replaced before the next dive.

Compatible Models

Sea Dragon 4500

Replaces Part Numbers

SL67510

Technical Specifications

Voltage14.8V
Amp Hours3000mAh
Capacity3000mAh
Rate44.4Wh
Net Weight232g /8.18 oz
Gross Weight302g /10.65 oz
Approximate Weight302g /10.65 oz
Dimension 80.70 x 43.60 x 42.42mm

Product Highlights

  • Brand: SeaLife
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Sea Dragon 4500 dims to a lower mode mid-dive even though the battery was fully charged before I got in the water — what's happening?

The flashlight's LED driver cuts output when cell voltage sags below its brownout threshold under high current draw — this happens under load before the pack is actually flat. It's most common on turbo mode, where draw is high enough to pull voltage down even from a full pack. Switch to standard or medium mode and the light should recover immediately as current demand drops. If it dims on medium mode too, check resting voltage after your next full charge — a healthy pack should read 16.6–16.8V; anything lower signals capacity fade.

One of my two Sea Dragon 4500 batteries loses charge much faster than the other — why?

Mixing packs of different ages or cycle counts causes the weaker pack to discharge faster because both cells aren't starting from the same capacity baseline. Under turbo-mode current draw, the weaker pack hits its low-voltage cutoff earlier, making it appear to drain at a different rate. Over time, repeatedly running a weaker pack harder than a stronger one accelerates cell degradation in the weaker unit. Replace both packs simultaneously from the same batch and the discharge rates will track together.

My Sea Dragon 4500 won't turn on after being stored for several months — is the battery dead?

Extended storage can pull Li-ion cells below the BMS's minimum re-initialisation threshold, causing the pack to appear dead. Connect the pack to the charger and leave it for at least two hours even if no charge indicator activates immediately — most BMS circuits will begin a recovery pre-charge below 2.5V per cell. If the charger shows no activity at all after two hours, check the charger output with a multimeter; the charger is often the fault, not the pack. A pack that recovers to a full 16.6–16.8V resting voltage after that session is safe to use.

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