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Three small rectangular prismatic lithium batteries with four tinned nickel pins each, flat silver finish

Omnicel

Omnicel 3.6V 400 mAh Li-SOCI2 651615 3-Pack

SKU CH-EM55-38XVH

Three 3.6 V lithium thionyl chloride cells deliver 400 mAh each in a compact prismatic 651615 package with four tinned nickel PCB pins

  • Battery type651615
  • 6 V lithium thionyl chloride chemistry delivers stable voltage for long-life applications
  • 400 mAh capacity supports extended operation in low-drain devices
  • Prismatic 651615 form factor fits tight PCB layouts at 15.3 mm by 16.5 mm by 6.7 mm
  • Four tinned nickel PCB pins enable direct board mounting without extra connectors
  • Three-cell pack provides ready spares for maintenance or multi-device deployments

Three-cell prismatic pack

This pack contains three Omnicel 651615 prismatic lithium thionyl chloride cells. Each cell delivers 3.6 volts and 400 milliampere-hours of capacity. The batteries measure 15.3 millimetres by 16.5 millimetres by 6.7 millimetres and weigh 4.6 grams each. Four tinned nickel PCB pins provide surface-mount termination.

Suited for low-drain embedded designs

Engineers designing memory-backup, real-time-clock or remote-sensor circuits that draw microampere-level current will match the chemistry’s high energy density and low self-discharge. Devices requiring pulse currents above a few milliamperes or rechargeable operation should select a different chemistry.

Steady voltage under continuous microampere load

Lithium thionyl chloride maintains a flat discharge curve while supplying constant microampere loads over years. The high internal resistance limits instantaneous current, so voltage sags quickly if the load spikes beyond the rated continuous capability.

How it compares

Measured against everything we stock in Household Batteries & Chargers, at today’s prices. Recalculated every night.

Price $40.99
Pricier than about 90% of the 10,440 comparable items (median $10.99).

Specifications

Power
Battery type651615

Questions about this item

What device footprint matches the 15.3 mm by 16.5 mm by 6.7 mm prismatic case of these EF651615 cells?

Equipment designed for the 651615 prismatic form factor with 4 PCB pin terminals will accept these batteries.

Can the 3.6 V output directly replace a 3.6 V lithium thionyl chloride cell in existing equipment?

Yes, these are 3.6 V Li-SOCl2 prismatic cells with the same chemistry and voltage as other LTC-3PN or EF651615 replacements listed.

How do I confirm each pack delivers the rated 400 mAh after installation?

Measure open-circuit voltage near 3.6 V and verify runtime matches the expected capacity draw for your application.

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