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Key Technical Specifications
| Parameter | Specification |
|---|---|
| Nominal Voltage | 3.6 V DC |
| Capacity | 4500 mAh (Milliampere-hours) |
| Chemistry | Nickel-Metal Hydride (NiMH) |
| Compatibility | Honeywell C300 Controller (CC-PCNT01/02) |
| Mounting | Snap-in Battery Holder on CC-SCMB02 Module |
| Operating Temp | -20°C to +60°C (Standard Industrial) |
| Weight | Approx. 0.2 kg (Battery pack only) |
| Safety Rating | UL Recognized Component / CE Compliant |
| Shelf Life | 3-5 Years (if stored properly) |
| Warranty | Typically 1 Year (DOA coverage) |
Product Introduction
Let’s be real: nobody wakes up in the middle of the night excited to change a battery. But when a C300 controller loses its logic because a 20-year-old battery died during a blip in the UPS supply, suddenly everyone cares about part number 51199942-300.This isn’t just a generic AA cell; it’s a specific 3.6V 4500mAh assembly designed to slot into the CC-SCMB02 memory backup chassis. I’ve seen plants lose hours of production time simply because they tried to hot-swap a controller without verifying this battery was holding a charge. The “300” suffix usually indicates a specific revision or packaging standard for the C300 series. It’s bulky, it’s heavy, and it holds the line between a seamless reboot and a total logic wipe. If you are running Experion PKS, this little brick is your insurance policy.
Quality SOP & Tech Pitfalls (The Reality Check)
We don’t just pull these off a dusty shelf and ship them. Batteries are tricky—voltage depression is real.The Lab Report (SOP):
- Visual Inspection: We check the casing for swelling or leakage. Old NiMH cells vent electrolyte that eats circuit boards alive.
- Open Circuit Voltage (OCV): We measure the terminal voltage with a calibrated Fluke multimeter. It must read >3.6V. Anything under 3.0V indicates deep discharge, and we reject it.
- Load Test: We apply a dummy load to verify it can sustain amperage without the voltage collapsing instantly.
- Date Code Verification: We physically inspect the mfg date. A “new” battery made in 2015 is essentially trash today.
The Engineer’s Warning (Pitfalls):
Don’t assume the battery is fully charged out of the box. I once watched a tech install a “new” surplus battery, clear the fault, and three days later get a “Low Battery” alarm. Why? Because the unit had been sitting in a warehouse at 40°C for five years.
Also, watch the polarity. The connector on the CC-SCMB02 board is keyed, but if you force it or hack the wires (which I have seen), you will fry the memory retention circuit. Don’t be that guy.
Installation & Configuration Guide
This is a delicate operation. You are working near live backplanes.
- Pre-Installation:
- ⚠️ CRITICAL: If possible, keep the main controller power ON while swapping the battery if the chassis supports hot-swap for that specific slot (check your manual). If not, ensure you have a full backup of your control strategy downloaded to the historian or engineering station.
- Verify the new part number matches the old one exactly (51199942-300).
- Removal:
- Locate the CC-SCMB02 module (usually right next to the controller).
- Gently release the battery holder latch. It’s plastic and brittle on older units—use finesse, not a screwdriver.
- Disconnect the wire harness plug from the PCB header. Do not pull by the wires.
- Installation:
- Connect the new 51199942-300 harness to the board. Ensure the clip clicks.
- Seat the battery pack into the holder. It should sit flush.
- Secure the retaining clip.
- Power-On & Testing:
- Cycle power if you turned it off.
- Check the LED status on the C300 controller and the SCMB module.
- Go into the Station Manager or ControlBuilder. Clear the “Battery Low” diagnostic alarm. It won’t clear instantly; it might take a few scan cycles or a manual reset command.
Compatible Replacement Models
| Compatibility Tier | Part Number | Notes |
|---|---|---|
| ✅ Direct Replacement | 143553 | This is the legacy part number. 51199942-300 is the modern equivalent. They are interchangeable. |
| ✅ Assembly Match | CC-SCMB02 | This is the module the battery plugs into. If your battery holder is broken, you need this whole unit, not just the battery. |
| ⚠️ Verify Fitment | 51199932-200 | Often confused. This is a different battery box or holder configuration. Check your physical housing before ordering. |
| ❌ Incompatible | Standard Li-ion | Do not try to rig a generic Lithium pack. The charging circuit on the SCMB02 is tuned for NiMH characteristics. |
Frequently Asked Questions (FAQ)
Q: Can I just buy generic AA NiMH batteries and tape them together?
A: Technically, yes, if you can find high-quality industrial 1.2V cells and wire three in series. But honestly? Don’t do it. The internal resistance of cheap cells varies, leading to thermal runaway or leakage inside your expensive controller chassis. Stick to the OEM assembly.Q: How long does this battery actually last?
A: In a climate-controlled cabinet (25°C)? About 5 to 7 years. If your panel is baking in the sun at 50°C, expect maybe 2 years. We recommend replacing them preventatively every 5 years.Q: My controller says “Memory Battery Low.” Do I have to shut down the process?
A: Usually, no. The C300 system is designed to allow battery replacement while powered, provided you do it quickly. However, if the battery is completely dead (0V), the moment you pull it, you lose RAM. Always have a UPS on the rack.Q: Is 51199942-300 the same as the 51199942-100?
A: They are functionally similar, but the suffix (-100, -200, -300) often denotes revision changes or specific regional certifications. For a direct swap, match the suffix if possible, or consult the cross-reference guide. The -300 is the most common current revision.Q: Does this come with the plastic holder?
A: Sometimes. Some listings sell just the battery pack (the brick with wires), while others include the snap-in plastic tray. Check the product photos carefully. If you already have the tray, you just need the brick.
