4S3P Battery Module *2.55 kWh*
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A CALB 4S3P lithium battery module, 2.55 kWh, brand new. Four cell groups in series, three cells in parallel, giving 174 amp hours at 14.68 volts nominal.
174 Ah in a single 14.68 volt module is a lot of capacity in one box. That suits a pack built for range rather than for peak power: fewer, larger modules means fewer interconnections, fewer joints to torque and inspect, and fewer cell taps to wire.
The low module voltage makes assembly safer. At under 15 volts a single module is not a shock hazard, so modules can be handled and wired individually and the high voltage system only exists once they are connected in series.
4S means your BMS needs four cell taps per module, not twelve. The three parallel cells in each group behave as one cell for monitoring.
Check which CALB module you have before buying accessories. This is the 2.55 kWh module, and it is not the same as the 2.2 kWh module despite both being described as 4S3P. Busbars and BMS connectors differ between them, and the energy figure is what separates them.
Key specifications
| Part | CALB26KWH4S3P |
|---|---|
| Configuration | 4S3P, four series groups of three |
| Nominal voltage | 14.68 V |
| Capacity | 174 Ah |
| Energy | 2.55 kWh |
| Cell taps required | 4 per module |
| Condition | Brand new |
Features
- 174 Ah in one module, so a high capacity pack needs fewer interconnections
- Under 15 V per module, so modules can be handled individually without a shock hazard
- Brand new rather than salvage of unknown history
- Four cell taps per module, so BMS wiring stays manageable
Compatibility
For EV conversions, renewable energy storage and stationary storage.
It needs a BMS. The module has no protection of its own. Every cell group needs monitoring and balancing.
Accessories are specific to the 2.55 kWh module. It takes the 12 pin BMS connector, not the 16 pin one used by the 2.2 kWh modules, and our right angle busbar does not fit it. Check the energy rating on your own modules before ordering anything to go with them.
In the box
- 1 x CALB 4S3P battery module, 2.55 kWh
Downloads
The module specification and a 3D CAD model in STEP format are in the Documents tab.
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