UP TO 2.8kWh CAPACITY
RBRfermata and RBRfermette³
Underwater battery canisters
The RBRfermata battery canister extends deployments of all instruments. It automatically configures the internal arrangement of batteries regardless of cell voltage (lithium at 3.6V, alkaline at 1.5V, Ni-MH at 1.2V) to provide the nominal output. Housing 48 individual D-cells and hosting three MCBH connectors, the RBRfermata has both a 14V and 28V option.
The RBRfermata extends deployments by providing up to 2.8kWh of energy to any underwater instrument, which is about 40 times greater than our standard battery carriage capacity. An innovative battery carousel coupled with quick-release handles facilitates simple, tool-free battery replacement. A variant with low-profile handles is available for flexible integration with the Wirewalker (DMO). Polyfuses ensure overcurrent protection, resetting automatically after a fault.
As an alternative, you can also extend your deployments using the compact RBRfermette³. Featuring a single MCBH connector, this battery canister accommodates 8 AA cells.
Features & Configurations
RBRfermette³
- 8 AA cell capacity (24Wh – 60Wh nominal)
- Single MCBH connector for distribution
RBRfermata
- Up to 2.8kWh capacity for extended deployments
- Overcurrent protection with automatic reset
- Pressure relief valve in bottom end-cap
- Three MCBH connectors for power distribution
- Quick-release handles for tool-free battery replacement
- Battery carousel for secure mounting of individual D cells
Optional Configurations
RBRfermata
- 14V or 28V variants
- Quick-release or low-profile handles
- 750m, 4000m, or 8000m depth rating
- Retrofitting options*
*Legacy RBRfermata battery canisters designed for shrink-wrapped battery packs can be retrofitted with the new battery carrousel, quick-release handles, and new electronic hardware. Contact RBR for details.
Specifications
RBRfermette³
| Power | 8 AA cells (24Wh-60Wh nominal) |
|---|---|
| Dimensions | 340mm x Ø63.3mm |
| Housing | Plastic or titanium |
| Weight | 960g in air, 430g in water |
| Depth rating | 750m, 4000m, 8000m |
RBRfermata
| Parameter | Model with quick-release handles | Model with low-profile handles |
|---|---|---|
| Power | 48 D-cells | 48 D-cells |
| Connectors | Three MCBH-6-FS | Three MCBH-6-FS |
| Housing | Plastic or Ti | Plastic or Ti |
| Length | 663mm | 686mm |
| Diameter | Ø140mm | Ø140mm |
| Handles | 250mm x 142mm | Ø140mm |
| Weight (plastic, with batteries)Footnote * | ~14-17kg in air, ~3-5kg in water |
~13-15kg in air, ~3-5kg in water |
| Weight (Ti, with batteries)Footnote * | ~27-30kg in air, ~16-18kg in water |
~29-32kg in air, ~19-22kg in water |
| Depth rating | 750m, 4000m, 8000m | 750m, 4000m, 8000m |
| Operating temperature | -5°C to 35°C | -5°C to 35°C |
(*) Dependent on battery type.
| Parameter | 14V variant | 28V variant | ||
|---|---|---|---|---|
| Battery type | Lithium thionyl chloride | Nickel metal hydride | Alkaline | Lithium thionyl chloride |
| Nominal voltage | 14.4V | 14.4V | 18.0V | 28.8V |
| Maximum current | 15A | 15A | 4A | 15A |
| Capacity | 2.8kWh | 0.5kWh | 0.9kWh | 2.8kWh |
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