Keyence KV-1000 Battery OP-51604 — 3V PLC Lithium Replacement

KEYENCE · KV-1000 Series · SRAM Backup Battery · MRO Consumable

The OP-51604 is the factory-specified 3V primary lithium battery for the Keyence KV-1000 series PLC platform. It backs up the CPU’s SRAM, retentive data registers, and ladder program memory when main power is removed — so an unplanned shutdown does not wipe recipe data, counter values or production counters. As an MRO consumable it is regularly stocked by maintenance teams running factory automation lines, machine builders, and vision inspection cells where KV-1000, KV-700 and KV-3000 controllers are still in service. Sourcing through KOEED removes the long lead times that come with Japanese OEM channels.

Key Technical Specifications & Overview

The OP-51604 is purpose-built for the KV-1000 platform and is electrically compatible with most KV-series CPUs that share the same battery connector footprint, including KV-1000, KV-700, KV-3000, KV-5000 and KV-7000 controllers. KOEED keeps OP-51604 on the shelf as a routine MRO consumable, alongside the PLC battery family for Allen-Bradley, Siemens, Mitsubishi and Omron controllers.

Application Scenarios & Where It Fits

The OP-51604 is deployed wherever a Keyence KV-1000 series PLC must retain process state through power cycles. Common fit-for-purpose scenarios include:

• Automotive body-in-white and assembly cells, where the KV-1000 holds torque counters, fault history and recipe numbers between shifts.
• Electronics SMT lines and factory automation cells that re-start every weekend and must not lose feeder recipes or production counts.
• Vision inspection stations pairing a KV-1000 with a Keyence CV-5000 / XG-8000 vision system, where job numbers and threshold values live in the PLC’s retentive memory.
• Packaging and labelling machinery that counts batch totals and must survive E-stops without losing the batch.
• Process skids (water treatment, food & beverage) where a Keyence PLC holds setpoints and totalizer values during a power outage.
• Long-life machines still running KV-1000 hardware from the 2010s, where the original battery has reached end-of-life and recent KOEED restocks are the fastest replacement route.

Adjacent plant floors typically mix PLC brands: a single line can run Fanuc CNC, Yaskawa Σ-7 servo drives, Schneider Magelis HMIs, Panasonic FP PLCs and a Keyence KV-1000 battery on the same panel — so a full BOM quote covering the entire machine often makes sense.

Integration & Wiring Notes

The OP-51604 is a self-contained battery pack, not a wired component, but a few integration points are worth flagging for the maintenance engineer planning a replacement window:

• Connector keying: the battery holder on the KV-1000 CPU is keyed — the OP-51604 connector can only be installed in one orientation. Do not force-fit a generic CR17335 cell where a holder is specified.
• Battery-low alarm: Keyence KV series raise a “BATT LOW” flag in the system area when the cell voltage drops below threshold. After replacement, clear the flag from the PLC error code database procedure and re-arm the CPU.
• Retention period: SRAM retention is specified at full cell voltage at 25 °C. High ambient temperatures (above 45 °C inside a control cabinet) shorten the effective service life — the same caveat applies to Allen-Bradley 1756-BATM and Siemens S7-400 backup batteries.
• Hot-swap behaviour: the OP-51604 is designed to be replaced with main power applied for a short window. Hold the replacement cell ready and complete the swap within the time the Keyence manual specifies (typically under 30 seconds) to avoid SRAM loss.
• Disposal: primary lithium cells are subject to local transport and disposal regulations. KOEED can advise on return programmes on a per-shipment basis through Moritta@KOEED.COM.

Installation & Commissioning Tips

Replacing an OP-51604 is a 5-minute maintenance task, but doing it methodically prevents the “lost program” call-out. Use the following sequence:

1. Back up the project first. Connect KV Studio / KV Builder to the CPU over USB or Ethernet and upload the current ladder program and register comments to a project file. This is your safety net even though the cell is supposed to retain the program.
2. Note the BATT LED state on the KV-1000 front panel before opening the cabinet. A red or flashing BATT indicator confirms the cell is the failure cause; a green LED means you are doing a scheduled preventive replacement.
3. Power state. Where possible, keep the PLC powered during the swap. If the cell has already failed, expect a brief CPU restart and accept the program will be reloaded from the upload in step 1.
4. Remove and seat the new OP-51604. Pull the old pack straight out of the holder, observe the connector key, and seat the new pack until the retaining clip clicks. Do not bend the contact pins.
5. Clear the BATT LOW flag from the KV Studio system area, verify the BATT LED is solid green, and re-cycle main power once to confirm the program and retentive data are intact.
6. Log the swap in the machine’s maintenance record with the cell serial and date — most plants use a 5-year planned replacement interval, similar to the cycle used for Mitsubishi Q-series batteries and Omron CJ-series cells.

For multi-PLC panels, building a small on-site spares kit of two or three OP-51604 cells — and rotating them into the annual maintenance window — is cheaper than a single unplanned line stoppage. Ask KOEED about bulk pricing for kit orders via the Create a Quote form.

Procurement, Warranty & Lead Time

KOEED sources OP-51604 through established Keyence channels, holds in-house stock for fast dispatch, and ships worldwide. The standard flow:

• RFQ turnaround: quote within 24 hours on business days — send the part number and quantity to Moritta@KOEED.COM.
• Lead time: in-stock items typically ship within 1–3 business days; non-stock or large quantities are quoted with a lead time on the same email.
• Warranty: KOEED-supplied batteries carry a 12-month replacement warranty against premature voltage loss under normal service conditions.
• Multi-brand BOM: pair the OP-51604 with related Keyence KV-1000 spares, or with cells for Allen-Bradley, Siemens, Mitsubishi, Omron, Fanuc, Schneider, Yaskawa and Panasonic platforms — one quote covers the whole panel.
• Shipping: DHL / FedEx / UPS worldwide with tracking; battery cells are shipped per IATA dangerous-goods rules and the consignment is declared accordingly.
• No-quote-needed browsing: explore the wider CPU module catalogue or read the engineering FAQ before placing an order.

Engineers who want a hands-on pre-sales view can also browse KOEED’s product gallery for related PLC spares, or read the China sourcing page to understand how the supply chain is structured. For everything else, the Contact Us page lists the available channels.

Need a different KV-1000 spare, or a part outside the Keyence line-up? Send a full BOM to Moritta@KOEED.COM and KOEED will quote the entire list — Allen-Bradley, Siemens, Mitsubishi, Omron, Fanuc, Schneider, Yaskawa, Panasonic and KEYENCE under one roof. See the About KOEED page for the company profile.