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Yamaha BS3C, CS3B 1970-1971 Battery | 12V 140CCA AGM | MB9U
Why Choose the MotoBatt MB9U Battery?
Guaranteed Compatibility
Precise dimensions match your original battery specifications perfectly
Ready to Install
Sealed AGM design arrives fully charged - no acid, no waiting
Superior Performance
140 CCA delivers reliable starting power in all conditions
Maintenance-Free
Sealed construction eliminates fluid level checks and top-offs
Complete Technical Specifications
| Specification | Value | Why It Matters |
|---|---|---|
| Voltage | 12V | Standard motorcycle electrical system compatibility |
| Capacity | 11 Amp Hour | Extended runtime for lights, ignition, and accessories |
| Cold Cranking Amps (CCA) | 140 | Reliable starting power even in cold weather |
| Height (with terminals) | 5.24" | Precise fit in your battery compartment |
| Length | 5.48" | Exact dimensions for secure mounting |
| Width | 2.99" | Perfect clearance with existing wiring |
| Weight | 7.39 lbs | Comparable to original for balanced handling |
| Maximum Charge Rate | 1.3A | Safe charging with standard motorcycle chargers |
Premium AGM Battery Technology
- ✓ Sealed AGM Construction: No acid spills, no corrosion, no ventilation requirements
- ✓ Factory Activated: Ships fully charged and ready for immediate installation
- ✓ Vibration Resistant: Robust construction handles motorcycle road conditions
- ✓ Deep Cycle Capability: Withstands repeated discharge/charge cycles better than conventional batteries
- ✓ Temperature Stable: Consistent performance across a wide temperature range
- ✓ Long Shelf Life: Maintains charge during storage periods
Installation & Compatibility
This battery has been carefully cross-referenced to ensure optimal compatibility with both Yamaha BS3C and CS3B models from 1970-1971. The MotoBatt MB9U meets or exceeds all original specifications while providing the convenience of modern sealed AGM technology.
Installation is straightforward: Simply remove your old battery, clean the terminals, and install the MB9U using your existing mounting hardware. No special tools or modifications required.
Full warranty protection from the date of delivery - your investment is protected
Frequently Asked Questions
Q: Will this battery fit my 1971 Yamaha CS3B exactly?
A: Yes, the dimensions are precisely matched to both BS3C and CS3B specifications for guaranteed fit.
Q: Do I need to add acid or charge before use?
A: No, this sealed AGM battery arrives fully charged and ready to install immediately.
Q: How does the 140 CCA compare to the original battery?
A: The 140 CCA rating meets or exceeds original specifications, ensuring reliable starting performance.
Q: What are the shipping costs?
A: Orders over $75 qualify for free ground shipping. Orders under $75 have an $8 ground shipping charge.
Q: What if I have questions about installation or compatibility?
A: Contact our battery specialists online or call toll-free at 1-877-775-4381 for expert assistance.
Shipping Information
- ✓ Free Ground Shipping on orders over $75
- • $8 ground shipping charge for orders under $75
- ✓ Ships fully charged and ready to install
Expert Battery Solutions Since 2010
Get the reliable power your vintage Yamaha deserves with our precision-matched MotoBatt MB9U. Questions? Our battery specialists are ready to help.
Call 1-877-775-4381 or contact us online today