25.2V 9Ah Underwater Power Tool Battery Pack — IP68 / IPX8 Waterproof Magnetic Switch LED Indicator, Factory Direct OEM
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Balder Power 25.2V / 9Ah lithium battery pack engineered for underwater power tools including grinders, drills, cutters, and subsea inspection equipment
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IPX8 / IP68 waterproof, validated to 50 meters submersion depth; magnetic switch eliminates mechanical penetration points
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50A continuous discharge — sustains 1,000W motor systems at full load; lightweight integrated carry handle for dive deployment
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LED battery level indicator; Samsung high-performance lithium cells; top-grade Japanese IC multi-level protection
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Factory direct wholesale, custom voltage / capacity / waterproof rating / OEM accepted
Product Description
The Balder Power 25.2V 9Ah lithium battery pack is purpose-built for professional underwater power tool applications where three requirements define product suitability: sustained high-depth waterproofing, reliable continuous discharge at 50A, and an operating interface that functions without mechanical switches or connectors that can leak at depth.
At 25.2V fully charged with a 9Ah capacity, this pack delivers 226.8Wh of usable energy — sufficient to sustain a 1,000W underwater motor through extended working sessions. The discharge architecture supports 50A continuous output, covering the operational load range of underwater angle grinders, rotary drills, reciprocating cutters, and inspection camera systems used in commercial diving, offshore maintenance, and underwater construction workflows.
The IPX8 waterproof rating is validated to 50 meters submersion depth, placing this pack in the performance bracket required for professional saturation diving operations and offshore platform maintenance tasks that operate well below recreational dive limits. The sealing system integrates a magnetic switch as the primary power control — eliminating the mechanical button penetration point that is the most common ingress failure mode in underwater battery enclosures. Power is activated and deactivated externally through the magnetic field without any physical aperture in the housing, maintaining full enclosure integrity at rated depth. The LED battery level indicator provides visual state-of-charge feedback on the surface and in clear-water conditions without requiring any additional penetration in the housing.
Internally, the pack uses Samsung high-performance lithium cells combined with top-grade Japanese IC protection logic for multi-level full-envelope safeguards. For procurement teams evaluating this battery for commercial diving equipment supply, tool OEM programs, or offshore services distribution, all electrical parameters — voltage, capacity, enclosure dimensions, and IP waterproof rating — are available for OEM/ODM customization.
Technical Parameters
| Parameter | Specification |
|---|---|
| Brand | Balder Power |
| Application | Underwater power tools — grinders, drills, cutters, inspection cameras, subsea equipment |
| Battery Type | Liquid (Li-ion) |
| Cathode Materials | LiNiMnCoO2 (NCM) |
| Nominal Voltage | 21.6V (nominal) / 25.2V (fully charged) |
| Rated Capacity | 9Ah |
| Energy | ~226.8 Wh |
| IP Rating | IP68 / IPX8 — Submersible to 50 meters depth |
| Max Continuous Discharge Current | 50A |
| Max Load Quantity (cells) | 50 |
| Power Switch | Magnetic switch (zero-penetration) |
| Battery Level Indicator | LED display |
| Carry Handle | Integrated |
| Cell Technology | Samsung high-performance lithium cells |
| Protection | Overcharge, Over-discharge, Over-temperature, Short-circuit (Top-grade Japanese IC) |
| Operating Temperature | −20°C to +60°C |
| Cycle Life | 500 cycles |
| Dimensions (L × W × H) | 155.5 × 91.5 × 99 mm (6.12 × 3.60 × 3.90 in) |
| Weight | 1.25 kg (2.76 lb) |
| Warranty | 12 months from shipment date |
| OEM / ODM | Accepted — voltage, capacity, dimensions, IP rating, enclosure markings customizable |
| Place of Origin | Guangdong, China |
Features & Advantages
✅ 🌊 IPX8 to 50 Meters: Professional-Depth Waterproofing
The Balder Power pack is rated and pressure-tested to IPX8 at 50 meters submersion depth — the operational benchmark for commercial diving and offshore maintenance applications. This exceeds the IP68 standard common in consumer and recreational marine equipment and meets the depth requirements of professional underwater tool use cases including offshore structure inspection, hull cleaning, pipeline maintenance, and underwater concrete cutting. The housing uses a fully sealed enclosure architecture with no mechanical switch penetrations; all cable exit points are epoxy-potted to prevent the micro-ingress that accumulates across repeated pressure cycles in deep-water deployments.
✅ 🔌 Magnetic Switch: Zero-Penetration Power Control
The magnetic switch system activates and deactivates battery output through external magnetic field interaction, with no physical button, lever, or switch penetrating the enclosure wall. This design eliminates the single most common waterproofing failure point in underwater battery packs — the mechanical actuator — which is subject to O-ring compression fatigue, corrosion, and seal degradation with repeated cycling at pressure. The magnetic activation mechanism is operable with diving gloves on and functions reliably at rated depth without any reduction in switching sensitivity. The LED battery level indicator provides state-of-charge visibility without additional housing penetrations, using a light-pipe transmission design sealed within the existing enclosure geometry.
✅ ⚡ 50A Continuous Discharge with Samsung Cells and Top-Grade Japanese IC Protection
At 50A continuous discharge, this pack delivers sustained 1,000W output to underwater power tools without thermal cutoff under rated operating conditions. The cell array uses Samsung high-performance lithium cells providing the energy density and rate capability required for professional-duty cycles. The BMS uses top-grade Japanese IC protection logic covering overcharge, over-discharge, over-current, over-temperature, and short-circuit events — all responding within milliseconds of fault detection. The carry handle is integrated into the enclosure design for single-hand deployment from the surface and secure tool-to-battery connection management during underwater work positioning.
Packing & Delivery
Secure & Compliant Packaging
To ensure safe transit for Class 9 Dangerous Goods, every battery is protected with high-quality Pearl Wool (EPE Foam) and encased in UN-certified cartons. For bulk shipments, we utilize sturdy Plywood or Plastic Pallets wrapped in shrink film, fully compliant with international shipping regulations.
Global Shipping Options (Incoterms)
We support flexible shipping terms to suit your business needs, including FOB, CIF, and DDP (Door-to-Door including tax).
- By Sea: The most economical choice for bulk orders.
- By Air / Express: Fast delivery for samples (DHL/UPS/FedEx).
- By Railway: Reliable CR Express service for European and Central Asian markets.
Production Lead Time
Our lead time varies based on product customization:
| Product Type | Samples | Bulk Order |
|---|---|---|
| Standard Models | 5 - 7 Days | 14 - 20 Days |
| Customized Models | 7 - 14 Days | 14 - 28 Days |
Global Safety Standards & OEM Compliance
When integrating a custom lithium battery pack into your device, regulatory compliance is non-negotiable. At Balder Power, our OEM battery solutions are engineered from the ground up to pass rigorous international safety tests. We ensure your custom packs meet CE, UL, and IEC performance standards, while providing the mandatory UN38.3 and MSDS reports required for seamless global shipping. From initial prototyping to final certification, we eliminate compliance hurdles to accelerate your product’s market entry.
FAQ
Q1: What is the actual tested waterproof depth of this battery?
The Balder Power pack is IPX8 / IP68 rated and validated to 50 meters submersion depth — the performance threshold for professional commercial diving and offshore maintenance operations. This substantially exceeds the IP67 standard (1 meter momentary immersion) and the IP68 ratings common in consumer marine electronics (typically certified to 3–10 meters). Pressure test reports and QC documentation are available for distributor qualification and procurement audits upon request.
Q2: How does the magnetic switch work underwater and can it be accidentally activated?
The magnetic switch activates battery output when a paired magnet is brought within operating range of the designated activation zone on the enclosure exterior. Because no physical mechanism penetrates the housing, there is no O-ring or gasket at the switch location — eliminating the primary leak point in conventional underwater battery designs. Accidental activation is prevented by the specific magnet geometry required for switching; standard environmental magnetic fields (tools, equipment, structural steel) do not trigger the switch. The system is operable with 5mm neoprene diving gloves and functions at rated depth without sensitivity loss.
Q3: What is the minimum order quantity and is OEM/ODM customization available?
Standard wholesale minimum order is 10 units, with tiered pricing at 30, 50, and 100+ units. OEM/ODM customization covers voltage, capacity, enclosure dimensions, IP rating, connector type, LED indicator configuration, magnetic switch sensitivity, and enclosure markings. OEM minimum is 50 units with a 7–10 working day lead time after sample approval. Engineering samples (1–3 units) are available before volume commitment. All shipments include UN38.3 and applicable certification documentation for air and sea freight compliance.
Q4: What underwater power tools is this battery compatible with, and what connector types are available?
The 25.2V 9Ah pack is designed for 1,000W-class underwater power tools including angle grinders, rotary drills, reciprocating cutters, hydraulic power units, underwater vacuum systems, core drilling equipment, and subsea inspection camera systems. Standard connector options include XT90, Anderson SB50, and custom wet-mate connectors for permanent subsea installation applications. Connector type, cable length, and cable jacket material (standard PVC or abrasion-resistant polyurethane for commercial dive environments) are all configurable on OEM orders.
Q5: How should the battery be maintained after use in saltwater environments?
Rinse all external surfaces including the connector face and LED indicator window with fresh water after each saltwater deployment. Apply a light coat of dielectric grease to the connector mating surfaces every 20–30 dive cycles. The magnetic switch zone requires no specific maintenance — the sealed activation area has no serviceable components. For long-term storage exceeding 30 days, discharge to 50–60% state of charge and store in a dry environment between 10°C and 25°C. Do not store fully charged or fully discharged.
Q6: Can this battery be used for surface power tool applications as well as underwater?
Yes — the 25.2V 9Ah pack operates identically in surface applications. The IPX8 rating and sealed enclosure impose no performance penalty in dry or wet surface conditions. This makes the pack suitable for topside power tool use on offshore platforms, vessel decks, and wet industrial environments where tool batteries are routinely exposed to spray, rain, and wash-down operations that would damage standard IP54 or IP55 rated tool batteries. The integrated carry handle and compact 155.5 × 91.5 × 99 mm footprint support surface deployment without additional mounting hardware.
