Power Tool Battery
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When discussing professional fusion splicers, it's easy to focus on the latest models. Yet on construction sites around the world, many experienced fiber technicians still rely on the Fujikura FSM-61S, FSM-62S, and FSM-80S every single day.
That isn't because these machines are outdated—it is because they continue to deliver dependable splice quality, excellent reliability, and a lower total cost of ownership than many newer alternatives.
For most owners, the real limitation isn't the splicer itself. It's an aging FSM-80S battery, which naturally loses capacity after years of charging cycles. Replacing the FSM-80S battery is often far more economical than purchasing an entirely new fusion splicer.
A Family of Proven Fusion Splicers
Rather than redesigning every generation from scratch, Fujikura refined a platform that had already earned the confidence of telecom contractors worldwide.
FSM-61S
The FSM-61S became one of the industry's benchmark core-alignment fusion splicers.
- PAS core alignment technology
- Dual CCD imaging system
- Automatic arc calibration
- Excellent splice consistency
- Outstanding long-term durability
Even after years of service, many refurbished FSM-61S units continue operating reliably in training centers and field maintenance teams.
FSM-61C
The FSM-61C shares nearly identical hardware with the 61S while being optimized for FTTH deployment.
- Simplified software interface
- Easy operation
- Efficient installation workflow
- Lower deployment costs
FSM-62S
The FSM-62S represents an important evolution of the 61 Series.
- Faster startup
- Quicker autofocus
- Improved automation
- Lighter body
- Longer battery runtime
Instead of changing splice quality dramatically, Fujikura focused on improving daily productivity.
FSM-62C
The FSM-62C targets FTTH and FTTx construction with software optimized for installation teams.
- Fiber-to-the-home deployment
- Broadband construction
- ISP maintenance
- Metropolitan fiber networks
FSM-80S
The FSM-80S introduced significantly higher automation.
- Automatic wind protector
- Automatic fiber clamps
- Automatic heater
- Shorter splice cycles
- Faster heat-shrink process
These improvements become increasingly valuable for engineers completing hundreds of splices every day.
FSM-80C
The FSM-80C uses nearly identical core hardware while serving different regional markets. Performance remains comparable to the FSM-80S across both FTTH and backbone fiber construction.
Performance Comparison
| Feature | FSM-61S | FSM-62S | FSM-80S |
|---|---|---|---|
| Alignment | PAS Core Alignment | PAS Core Alignment | PAS Core Alignment |
| Typical SM Loss | 0.02 dB | 0.02 dB | 0.02 dB |
| Typical MM Loss | 0.01 dB | 0.01 dB | 0.01 dB |
| Splicing Speed | Fast | Faster | Fastest |
| Automation | Good | Better | Excellent |
In real engineering environments, splice quality depends far more on fiber cleanliness, cleaver condition, electrode wear, and technician experience than on the generation of the fusion splicer itself.
The Part That Ages First
Rechargeable lithium batteries naturally lose capacity after hundreds of charging cycles. The most common signs include:
- Reduced operating time
- Unexpected shutdowns
- Fewer splice-and-heat cycles
- Longer charging periods
- Lower field productivity
In many cases, replacing the FSM-80S battery immediately restores reliable all-day performance without replacing the entire machine.
Why Replacing the Battery Makes Sense
The optical alignment system, CCD cameras, mechanical components, and arc calibration system of Fujikura fusion splicers often remain in excellent condition for many years.
However, batteries are consumable components. Installing a quality FSM-80S battery offers several advantages:
- Restore full-day operation
- Improve charging stability
- Reduce downtime
- Lower maintenance costs
- Extend equipment lifespan
- Avoid unnecessary replacement of expensive fusion splicers
Battery Compatibility
The popular BTR-09 replacement battery is compatible with multiple Fujikura models, including:
- FSM-61S
- FSM-61C
- FSM-62S
- FSM-62C
- FSM-80S
- FSM-80C
Depending on the manufacturer, compatible batteries are commonly available in capacities ranging from approximately 5200mAh to over 8000mAh. Choosing a reliable FSM-80S battery helps maximize runtime for demanding field applications.
Pros
- Excellent splice accuracy
- Reliable PAS core alignment
- Outstanding engineering durability
- Stable long-term performance
- Widely available replacement parts
- Easy access to compatible FSM-80S battery options
Cons
- Older units may require electrode replacement.
- Heating components wear after long-term use.
- Official firmware support is limited.
- Original batteries eventually reach the end of their service life.
Final Verdict
The Fujikura FSM-61S, FSM-62S, FSM-80S, and their C-series counterparts continue to demonstrate why they remain respected throughout the fiber optic industry. Their outstanding splice quality, dependable PAS core alignment, and durable engineering make them valuable even years after their initial release.
Before replacing an entire fusion splicer, consider replacing the FSM-80S battery. A quality replacement battery can restore mobility, improve productivity, reduce downtime, and significantly extend the working life of these trusted professional fusion splicers.