25.2V 4Ah IP68 Waterproof Lithium Battery for Underwater Drones & AUVs — 100m Depth Rated, 5C Discharge, 7S1P Thruster Pack
-
Balder Power 25.2V / 4Ah / 7S1P NCM lithium thruster battery engineered for underwater drones, AUVs, ROVs, and multi-stage parallel underwater propulsion systems
-
IP68 waterproof to 100 meters depth — pressure-rated for deep inspection, survey, and search operations
-
5C continuous discharge — delivers sustained high-current bursts for thruster acceleration and directional control in strong underwater currents
-
900g / 120×84×84mm compact form factor; 800-cycle service life; −20°C to +60°C operating range
-
Factory direct wholesale, custom voltage / capacity / depth rating / OEM accepted
Descrição do produto
The Balder Power 25.2V 4Ah lithium thruster battery is designed for the engineering constraints that define underwater drone, AUV, and ROV power systems: depth pressure that demands structural enclosure integrity at 100 meters, current demand profiles that require 5C peak discharge for thruster response, and volume and weight budgets where every gram and cubic centimeter affects vehicle buoyancy and maneuverability.
At 25.2V fully charged with a 4Ah capacity, this pack delivers 100.8Wh in a 120 × 84 × 84 mm footprint weighing 900g. The 7S1P cell configuration — seven cells in series, single parallel string — is optimized for voltage headroom over thruster drive systems in the 24–26V class while maintaining the compact cross-section required to fit within the pressure housings and payload bays of small-format AUVs, inspection ROVs, and multi-thruster underwater drone platforms. The 5C maximum continuous discharge rate (20A from a 4Ah pack) provides the instantaneous current delivery required for thruster vectoring, sudden direction changes, and counter-current maneuvering without voltage sag triggering BMS protection cutoff at peak load.
The IP68 enclosure is pressure-rated to 100 meters depth — a benchmark that covers the full operational envelope of commercial inspection ROVs, scientific AUV survey platforms, and military-grade underwater drone systems. At 100 meters, hydrostatic pressure reaches approximately 11 bar; the enclosure sealing architecture is designed to maintain integrity under this continuous pressure loading across repeated dive cycles, not just for momentary submersion. The 800-cycle rated service life reflects the professional multi-season use case of AUV and ROV fleets that complete multiple dives per operating day across extended survey campaigns.
For procurement engineers evaluating this battery for underwater vehicle OEM integration, research institution fleet supply, or defense contractor procurement, voltage, capacity, depth rating, connector type, and multi-pack parallel configuration are all available for OEM/ODM customization.
Parâmetros técnicos
| Parâmetro | Especificação |
|---|---|
| Marca | Balder Power |
| Aplicativo | Underwater drones, AUVs, ROVs, underwater thrusters, multi-stage parallel propulsion systems |
| Tipo de Bateria | Li-ion (NCM) |
| Cathode Materials | LiNiMnCoO2 (NCM) |
| Configuração da célula | 7S1P |
| Tensão Nominal | 25.2V (fully charged) |
| Capacidade nominal | 4Ah |
| Energia | ~100.8 Wh |
| Classificação IP | IP68 — depth-rated to 100 meters |
| Corrente máxima de descarga contínua | 5C (20A) |
| Corrente de carga máxima | 1C (4A) |
| Multi-Pack Configuration | Parallel expansion supported for extended mission endurance |
| Ciclo de vida | 800 cycles |
| Temperatura de operação | −20°C to +60°C |
| Dimensions (L × W × H) | 120 × 84 × 84 mm (4.72 × 3.31 × 3.31 in) |
| Peso | 900g (28.22 oz) |
| Garantia | 12 meses a partir da data de envio |
| OEM / ODM | Accepted — voltage, capacity, depth rating, connector type, parallel configuration customizable |
| Local de origem | Guangdong, China |
Características e vantagens
✅ 🌊 IP68 Pressure-Rated to 100 Meters: Deep-Water AUV and ROV Operational Envelope
The Balder Power 25.2V 4Ah pack is pressure-tested to 100 meters depth — the threshold that separates recreational underwater camera housings from professional inspection and survey vehicle battery specifications. At 100 meters, hydrostatic pressure is approximately 11 bar, loading the enclosure seals with forces that expose any design weakness in gasket compression, cable penetration potting, or connector interface geometry. The enclosure sealing system is validated under sustained pressure loading, not momentary submersion, ensuring consistent IP68 integrity across the repeated dive profiles of AUV and ROV operational use. This depth rating covers commercial pipeline and infrastructure inspection (typically 30–80m), scientific seabed survey AUVs (commonly 100–300m working depth for shallow-class vehicles), and military-specification underwater drone systems operating in coastal and harbour environments.
✅ ⚡ 5C Continuous Discharge for Thruster Vectoring and Counter-Current Operation
At 5C continuous discharge, this pack delivers 20A sustained current from a 4Ah capacity — the rate required for underwater thruster systems that must respond to sudden directional commands, stabilize against tidal current loads, and execute rapid position changes during inspection station-keeping. Underwater drone and AUV thruster loads are highly dynamic: hovering in still water draws 1–2C, while counter-current thrust or rapid ascent can demand 4–5C peaks. A battery rated for 1C or 2C continuous will trigger BMS overcurrent protection during these peak demand phases, interrupting thruster control at precisely the moments when positioning accuracy is most critical. The 5C continuous rating of the Balder Power pack eliminates this failure mode across the full operational thrust range of typical 25V-class underwater propulsion systems.
✅ 🔧 900g Compact 7S1P Architecture for Multi-Stage Parallel Thruster Integration
At 900g and 120 × 84 × 84 mm, this pack is sized for integration into the pressure housings and payload bays of small-format AUVs and multi-thruster ROV frames where buoyancy balance and internal volume constraints govern the mechanical design. The 7S1P configuration allows multiple packs to be connected in parallel to scale capacity for extended mission endurance without changing the voltage architecture of the vehicle’s power distribution system — a common OEM requirement for survey AUVs where mission duration is a primary performance parameter. The 800-cycle rating supports multi-season fleet operation: a vehicle completing two dives per day, five days per week maintains rated pack capacity for approximately 80 weeks of operational service before capacity replacement becomes necessary.
Embalagem e entrega
Embalagem segura e em conformidade
Para garantir o transporte seguro de mercadorias perigosas da Classe 9, todas as baterias são protegidas com Lã de pérola de alta qualidade (espuma EPE) e envolto em Caixas certificadas pela ONU. Para envios em grande quantidade, utilizamos embalagens resistentes. Paletes de madeira compensada ou plástico Embalado em filme termoencolhível, em total conformidade com as normas internacionais de transporte.
Opções de envio global (Incoterms)
Oferecemos condições de envio flexíveis para atender às necessidades do seu negócio, incluindo: FOB, CIF e DDP (Porta a Porta com impostos incluídos).
- Por mar: A opção mais econômica para pedidos em grande quantidade.
- Por via aérea/expressa: Entrega rápida de amostras (DHL/UPS/FedEx).
- De trem: Serviço CR Express confiável para os mercados europeu e da Ásia Central.
Prazo de Produção
Nosso prazo de entrega varia de acordo com a personalização do produto:
| Tipo de produto | Amostras | Pedido em grande quantidade |
|---|---|---|
| Modelos padrão | 5 a 7 dias | 14 a 20 dias |
| Modelos personalizados | 7 a 14 dias | 14 a 28 dias |
Padrões Globais de Segurança e Conformidade com o Fabricante Original do Equipamento (OEM)
Ao integrar uma bateria de lítio personalizada em seu dispositivo, a conformidade com as normas regulamentares é imprescindível. Na Balder Power, nossas soluções de baterias OEM são projetadas desde o início para atender aos rigorosos testes de segurança internacionais. Garantimos que suas baterias personalizadas atendam aos padrões de desempenho CE, UL e IEC, além de fornecer os relatórios obrigatórios UN38.3 e MSDS necessários para um envio global sem problemas. Da prototipagem inicial à certificação final, eliminamos os obstáculos à conformidade para acelerar a entrada do seu produto no mercado.
Perguntas frequentes
Q1: What is the actual pressure-tested depth rating, and how is it validated?
The Balder Power 25.2V 4Ah pack is IP68 rated and pressure-tested to 100 meters depth, equivalent to approximately 11 bar hydrostatic pressure. Validation is performed under sustained pressure loading — not momentary submersion — using a pressure chamber that holds the unit at rated depth for a minimum test duration per production batch. This distinguishes the rating from consumer-grade IP68 certifications that are typically validated at 1–3 meters for 30 minutes. Pressure test reports and QC documentation are available for OEM integration teams and research institution procurement audits upon request.
Q2: How does the 5C discharge rating affect thruster performance in strong underwater currents?
At 5C continuous, the pack delivers 20A sustained current — sufficient for thruster systems that must maintain station-keeping against tidal or river currents at maximum thrust without triggering BMS overcurrent protection. The critical advantage of a 5C-rated pack over a standard 1C or 2C battery in AUV and ROV applications is that it can sustain peak thruster demand continuously, not just in short bursts. For vehicles operating in environments with variable current — coastal survey work, harbour inspection, or pipeline following — this means the power system never becomes the limiting factor in vehicle controllability. The 1C maximum charge rate allows a depleted pack to return to full capacity in approximately 1 hour on a compatible 4A charger.
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, depth pressure rating, connector type and pin configuration, cable jacket material, parallel configuration BMS logic, 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 documentation for air and sea freight compliance.
Q4: How do multiple packs connect in parallel for extended mission endurance, and what are the BMS requirements?
For parallel multi-pack configurations, packs must be matched to within 0.1V state of charge before connection to prevent cross-charging current between units. A pre-charge relay circuit is recommended for systems connecting three or more packs simultaneously. The Balder Power BMS supports parallel operation with standard parallel-string protection logic. For OEM vehicle integration where automatic parallel switching is required — such as hot-swap endurance extension during extended survey missions — custom BMS firmware with parallel-enable safety flags and voltage delta lockout is available on OEM orders. Contact our engineering team with your vehicle power architecture for integration guidance.
Q5: What connector types are available and how are cable penetrations sealed at 100 meters?
Standard connector options include XT60, XT90, SubConn circular series, and Cobalt series wet-mate connectors for permanent subsea installation. All cable penetrations through the enclosure use epoxy potting compound with secondary O-ring compression seals, rated for sustained pressure loading at 100 meters. For OEM integration into existing vehicle pressure housings, bare cable exit configurations with specified jacket material (standard PVC or polyurethane for abrasion resistance) are available. Custom wet-mate connector configurations for hot-swap underwater battery exchange are available on OEM orders.
Q6: How should the pack be stored and maintained between AUV or ROV operations?
Rinse the enclosure exterior and connector face with fresh water after each saltwater dive. For extended storage between survey campaigns (30+ days), discharge to 50–60% state of charge and store in a dry environment between 10°C and 25°C. At the −20°C lower operating temperature limit, discharge capacity will be reduced — allow the pack to equilibrate to above 0°C before commencing high-current thruster operations in cold-water environments. For fleet operations completing multiple dives per day, a capacity check every 100 cycles using a calibrated discharge tester allows early identification of cells approaching end-of-life before capacity reduction affects mission endurance.
