ABB SAFT183VMC | Battery Unit for S800 I/O, 1.2Ah

Description

Product Introduction

That refinery in Texas—the one with the AC 800M controllers running the catalytic cracker—had a “battery low” alarm last winter. The tech on shift ignored it because the system was running fine. Three months later, a power supply glitch caused a momentary outage, and the CPU lost its program. The SAFT183VMC battery had finally died, and there was no backup to hold the SRAM. They had to reload the application from scratch—four hours of downtime on a $100,000/hour unit.

The ABB SAFT183VMC is a small but critical component in ABB’s S800 I/O system. It’s a 3.6V nickel-cadmium (NiCd) battery pack with a 1.2Ah capacity, designed to be soldered or socketed onto the PCB of various modules—CPUs, power supplies, and some communication interfaces. When main power is lost, this battery keeps the SRAM alive and the real-time clock ticking. Without it, the module forgets its configuration and the clock resets. The SAFT183VMC is rechargeable—it gets topped up whenever the module is powered. But after 5–7 years, the cells age and need replacement.

Key Specifications

Quality Inspection Process (SOP Transparency)

A battery is simple, but we test every one.

1. Incoming Verification
   • Match the model: SAFT183VMC. (There are counterfeit versions—check the SAFT logo and ABB branding.)
   • Visual inspection: Look for corrosion on the pins. Check the plastic case for cracks.
   • Verify the date code (if visible)—fresher is better.
2. Voltage Test
   • Measure open-circuit voltage with a multimeter.
   • Should be 3.6V ±0.2V if fully charged.
   • If below 3.4V, we recharge it (if possible) or replace.
3. Capacity Test (Sample Basis)
   • For a sample of batteries from each lot, we discharge at 100 mA to 3.0V.
   • Measure delivered capacity—should be >1.0Ah (80% of rated).
   • If a sample fails, we test the whole lot.
4. Physical Inspection
   • Check pin alignment—should be straight, 0.1″ spacing.
   • Inspect the vent (if present)—no leaks, no bulging.
5. Final QC & Packaging
   • QC sticker with test date.
   • Wrap in anti-static bag (pins are ESD-sensitive).
   • Box in padded envelope.
   • Test report included—voltage reading.

Field Replacement Pitfalls

I’ve swapped these in hundreds of modules. Here’s where people go wrong.

❗Polarity
The PCB is marked with + and -. If you install the battery backwards, you’ll damage the charging circuit—and possibly the module. Check the polarity before soldering or inserting.

Soldering vs. Socket
Some modules have the battery soldered directly to the PCB. If you’re replacing a soldered battery, you need a soldering iron and some skill. Desolder the old one quickly—excessive heat can damage the PCB. Use a socket for the new one if possible (makes future replacement easier).

Rechargeable vs. Non-Rechargeable
The SAFT183VMC is rechargeable. Do NOT replace it with a non-rechargeable lithium cell—it will be destroyed by the charging circuit.

Date Code
Batteries age even on the shelf. A battery manufactured 5 years ago may have lost capacity even if never used. We try to stock only fresh stock (date code within 2 years).

Disposal
NiCd batteries contain cadmium—toxic. Dispose of old batteries properly, not in the trash.

Nail these five, and your S800 modules will keep their memory for another 5 years.

New Original vs. Refurbished: Why It Matters

“New Original (New Surplus)” means this battery was manufactured by SAFT for ABB, packed in its original packaging, and never installed. The cells have zero charge/discharge cycles and have been stored properly.

Refurbished risk in plain terms
There’s really no such thing as a “refurbished” battery. Any used battery has lost capacity and has a shorter remaining life. Some sellers may remove old batteries from modules and resell them—that’s just a used battery with unknown history.

Real cost of a used battery
If a used battery fails, your module loses its memory. You have to reload the program, reconfigure the module, and possibly recalibrate. That’s hours of work. The cost of a new battery is trivial compared to that.

What we provide as proof

• ABB/SAFT packaging.
• Date code (if visible).
• Voltage measurement.
• 12‑month warranty (against defects, not capacity loss).

Pricing context
We’re priced competitively with other new-old-stock suppliers. A few dollars more than “pulled” batteries, but you get fresh cells and a warranty.

Performance Benchmarks & Test Results

Test conditions: 24 °C ambient, discharged at 100 mA.

We keep the test data—ask, and we’ll email the PDF.

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