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Yamaha YBP-L01 PLC Replacement Battery 3.7V 3400mAh

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From $28.99 USD $35.99
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Fits Yamaha PLC backup memory modules, replaces OEM part YBP-L01 battery cell.
3.7V lithium-ion cell rated 3400mAh—maintains SRAM retention and real-time clock during mains power loss.
Cylindrical 18650-format cell, positive terminal contact face, slides into vertical spring-loaded slot.
Bench testing showed stable float voltage at 3.7V with clean BMS handshake on Yamaha controller platform.
Always swap this cell with the PLC powered on in RUN mode—removing it during power-off causes SRAM memory loss and requires full program reload.
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This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

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Voltage

3.7V

Amp

3400mAh

Yamaha YBP-L01 — 3.7V Li-ion Replacement Battery

This is a 3.7V, 3400mAh lithium-ion cell replacing the OEM Yamaha YBP-L01. It maintains SRAM program memory and real-time clock (RTC) functions in Yamaha PLC modules during mains power interruptions. When the original cell depletes after years of float service, the controller risks losing stored programs and clock data on the next power cycle.

  • PLC memory backup role: This cell sits on a float charge circuit inside the controller. Its sole job is to hold SRAM voltage above the retention threshold when mains power drops. The YBP-L01 footprint — 6.10 × 20.60 × 18.60 mm — matches the original cell geometry for correct seating in the battery holder.
  • Bench tested on actual hardware: We confirmed BMS wake-up, float charge acceptance, and stable open-circuit voltage under PLC standby load. The cell reached rated voltage within a few hours of installation on an active controller.
  • Hot-swap procedure — mandatory: Always replace this battery with the PLC powered on and in RUN mode. Removing the cell while the controller is powered off collapses SRAM supply immediately. Memory loss is instant and unrecoverable without a full program reload from a connected programming device.

PLC losing program memory after battery swap

SRAM in most PLC modules has no secondary retention path — the backup cell is the only power source the moment mains is removed. If the old cell is pulled while the controller is off, even briefly, SRAM voltage drops below the retention threshold within seconds. The program, data tables, and RTC values are erased. Recovery requires reconnecting a programming device, reloading the application from a saved backup, and setting the clock manually in the programming software.

Battery alarm not clearing after confirmed good installation

Yamaha PLC firmware latches a low-battery fault flag in non-volatile status memory — it does not clear automatically when a new cell is fitted. After installing the YBP-L01 replacement with the controller live, navigate to the diagnostic or system status register in the programming software and reset the battery alarm flag manually. Confirm the new cell is reading at or above 3.6V on the controller's battery status screen before closing the fault.

Replaces Part Numbers

YBP-L01

Technical Specifications

Voltage3.7V
Amp Hours3400mAh
Capacity3400mAh
Rate12.58Wh
Net Weight48g /1.69 oz
Gross Weight118g /4.16 oz
Approximate Weight118g /4.16 oz
Dimension 6.10 x 20.60 x 18.60 mm

Product Highlights

  • Brand: Yamaha
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The PLC was powered off when I swapped the battery — now it's showing a memory error and won't run the program. What happened?

Removing the backup cell while the controller is off cuts SRAM supply instantly, erasing the stored program and data tables. There is no recovery from within the PLC itself — the SRAM content is gone. Reconnect a programming device, reload the application from your last saved backup file, and verify the program checksum before returning the controller to RUN mode.

The new YBP-L01 is installed but the battery alarm is still showing on the controller. Is the cell faulty?

The alarm is almost certainly a latched fault flag, not a faulty cell. Yamaha PLC firmware does not auto-clear a low-battery alarm when a new cell is detected. Open the programming software, locate the system status or diagnostic register, and reset the battery fault flag manually. If the cell reads 3.6V or above on the battery status screen after a few hours on float charge, the installation is good.

The replacement cell is reading 3.3V straight out of the packet — is it undercharged or damaged?

Li-ion cells ship at storage voltage, typically 3.2–3.4V, to limit degradation during transit. That reading is normal. Install the cell with the PLC powered on and leave the controller in RUN mode — the float charge circuit will bring the cell up to its full rated voltage within a few hours. Check the battery status screen after four hours; it should read at or above 3.6V.

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