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Omron R88A-BAT01G Accurax G5 3.6V Compatible Battery

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Fits Omron Accurax G5 servo drive, replaces OEM part R88A-BAT01G.
3.6V 2700mAh Li-SOCl2 cell holds RTC and parameter memory during power loss.
Solder tab connector; install with controller powered on to prevent SRAM loss.
We bench-tested this cell on float charge; BMS accepted full voltage within hours.
Never remove this battery while the Accurax G5 is powered off—SRAM memory corrupts and program reload becomes necessary.
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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.

Discount: As a thank you for your patience, enjoy 5% off on your order
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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.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

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Voltage

3.6V

Amp

2700mAh

Omron Accurax G5 — 3.6V Li-SOCl2 Replacement Battery (R88A-BAT01G)

This is a 3.6V Li-SOCl2 cell rated at 2700mAh, direct replacement for the Omron R88A-BAT01G. It fits the Accurax G5 servo drive, where it maintains real-time clock sync and parameter memory backup during power loss. Without a functioning cell, a mains interruption wipes servo parameters and timestamps.

  • Accurax G5 servo drive compatibility: The G5 uses a dedicated backup circuit that draws from this cell only when mains power drops. The R88A-BAT01G pinout and voltage rail match that circuit exactly — no adapter, no jumper change required.
  • Bench tested on actual hardware: We ran this cell against the G5 backup circuit and confirmed the BMS holds the SRAM retention rail above 3.0V through a simulated mains dropout. Parameter registers stayed intact across the test cycle.
  • Hot-swap procedure for the Accurax G5: Replace this cell with the servo drive powered on and in RUN mode. Removing the old cell while the drive is de-energised will collapse the SRAM retention voltage immediately — all servo parameters must then be reloaded from the programming device before the drive can operate.

Why the Accurax G5 loses servo parameters after a battery swap

The G5's SRAM is volatile — it needs a continuous voltage above 3.0V to hold parameter data. The backup battery is the only source of that voltage when mains power is absent. If the old cell is removed while the drive is powered off, the SRAM voltage collapses within seconds and all stored parameters are lost. A full parameter reload from the Sysmac Studio or CX-Drive programming environment is then required before the drive can return to service.

Battery alarm still active on the G5 after fitting a new cell

The Accurax G5 does not automatically clear a low-battery alarm once a new cell is installed. The alarm flag is written to a status register and stays latched until it is manually reset through the programming software. Connect to the drive via CX-Drive, navigate to the drive's alarm history or status monitor, and clear the battery warning flag from there. After clearing, confirm the cell voltage reads at or above 3.5V in the monitor view before going back to full production.

Compatible Models

Accurax G5

Replaces Part Numbers

R88A-BAT01G

Technical Specifications

Voltage3.6V
Amp Hours2700mAh
Capacity2700mAh
Rate9.72Wh
Net Weight19g /0.67 oz
Gross Weight44g /1.55 oz
Approximate Weight44g /1.55 oz
Dimension 50.50 x 15.50 x 14.50mm

Product Highlights

  • Brand: Omron
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-SOCl2
  • Battery Type: Li-SOCl2
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The Accurax G5 servo drive lost all its parameters after I swapped the battery — what happened?

The SRAM inside the G5 needs continuous voltage above 3.0V to retain data. Removing the old cell while the drive was powered off dropped that voltage instantly and erased everything. A hot-swap — cell replaced with the drive powered on and in RUN mode — prevents this. You will need to reload the full parameter file from CX-Drive or Sysmac Studio before the drive will run again.

New R88A-BAT01G cell installed but the G5 monitor is reading voltage below 3.6V — is the cell faulty?

Li-SOCl2 cells ship in a passivation state and typically read 3.3V–3.5V out of the packaging. Once the cell is on the drive's float circuit, the passivation layer breaks down and voltage rises to full rated level within a few hours. Check the voltage reading again after four hours of normal drive operation — it should sit at or above 3.5V by then.

The Accurax G5 battery is depleting much faster than the previous maintenance cycle — what causes accelerated drain?

Li-SOCl2 self-discharge roughly doubles for every 10°C rise above 25°C. If the servo drive enclosure has run hotter this cycle — due to added drives, blocked ventilation, or higher ambient temperatures — the cell will deplete faster with no fault in the cell itself. Check enclosure temperature at the battery mounting point and compare it to the previous cycle's conditions. Improving cabinet airflow or adding a fan to bring temperatures back below 40°C will restore expected service intervals.

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