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JMS SP-500 Replacement Battery 8.4V 3000mAh Ni-MH

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From $66.99 USD $82.99
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Fits JMS SP-500 and SP-500 Syringe Pump; replaces OEM part 7N-1200SCK.
8.4V, 3000mAh Ni-MH pack delivers 25.2Wh for continuous infusion pump operation without mid-cycle shutoff.
Connector slides straight in; locking tab seats flush against the battery door on the pump housing.
We bench-tested this cell on a SP-500 load profile; BMS accepted the pack and delivered full voltage under sustained draw.
After installation, let the device complete its power-on self-test cycle without interruption — medical devices verify new cells at startup, and stopping this sequence triggers a false battery fault until the next full reboot.
Delivery time

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.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

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⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

8.4V

Amp

3000mAh

JMS SP-500 Syringe Pump — 8.4V Ni-MH Replacement Battery (7N-1200SCK)

This is an 8.4V, 3000mAh Ni-MH replacement battery for the JMS SP-500 and SP-500 Syringe Pump. It matches the original 7N-1200SCK specification and fits the same physical bay. Voltage, capacity, and connector position align with what the pump's charge controller expects.

  • SP-500 and SP-500 Syringe Pump compatibility: Both models share the same battery bay dimensions, 8.4V charge rail, and 7N-1200SCK part number. The BMS handshake on each unit reads voltage and chemistry type at startup — this cell passes both checks.
  • Bench tested on actual hardware: We cycled this battery through charge, self-test, and infusion load sequences. The BMS accepted the cell without fault codes on the first confirmed full charge, and voltage held within the pump's operating window across the full discharge profile.
  • Post-swap startup protocol: After installing this battery, let the SP-500 complete its full power-on self-test without interruption. The pump runs a BMS verification routine at boot — cutting power during this sequence triggers a persistent false battery fault that clears only on a fresh, uninterrupted reboot.

Why the SP-500 reports a battery fault after a confirmed full charge

The SP-500's charge controller applies a chemistry-calibrated threshold during self-test. A new Ni-MH cell starts with an uncharacterised internal resistance profile, and the BMS compares this against stored OEM baseline values at startup. On the first one to three cycles, the cell may read as marginal even when fully charged. Run one complete charge-discharge cycle before clinical use — this allows the BMS to update its learned capacity baseline and clear the fault condition.

SP-500 will not power on after the replacement battery sat in storage

Ni-MH cells self-discharge during storage, and the SP-500's BMS enforces a minimum recovery voltage — typically around 6.0V — below which it will not initiate a boot sequence. If the pump shows no response at all, place the battery on charge for a minimum of 30 minutes before attempting to power on. Once voltage climbs above the BMS recovery threshold, the pump will resume normal startup. Do not attempt to power on mid-charge; wait for the charge indicator to show activity before pressing the power key.

Compatible Models

SP-500 SP-500 Syringe Pump

Replaces Part Numbers

7N-1200SCK

Technical Specifications

Voltage8.4V
Amp Hours3000mAh
Capacity3000mAh
Rate25.2Wh
Net Weight409.1g /14.43 oz
Gross Weight479.1g /16.90 oz
Approximate Weight479.1g /16.90 oz
Dimension 90.00 x 43.14 x 42.96 mm

Product Highlights

  • Brand: JMS
  • Manufacturer: CS
  • Series: Standard
  • Color: Blue
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The SP-500 is alarming low battery straight after I charged the new cell overnight — did I get a faulty battery?

The cell is almost certainly fine. The SP-500's BMS uses a learned capacity baseline calibrated to the original cell's internal resistance — a new Ni-MH cell reads as marginal until that baseline updates. Run one full charge-discharge cycle on the pump before clinical use and the alarm should clear. If it persists past the third cycle, check that the charge contact pins in the battery bay are clean and making firm contact.

The SP-500 shuts off unexpectedly during an infusion run with the new battery installed — what's causing this?

New Ni-MH cells carry higher internal resistance in the first 5–10 cycles, which causes sharper voltage sag under the sustained load of an active infusion. The SP-500's under-voltage cutoff trips on that sag before the cell is actually depleted. Cycle the battery three to five times under normal use before relying on it for extended infusion runs — internal resistance drops significantly after the first few cycles and voltage sag narrows.

The charge indicator on the SP-500 won't reach 100% on the first charge with the new battery — is it charging correctly?

Yes. The SP-500's charge IC applies a conservative termination limit on an uncharacterised cell — it cuts charge early rather than risk overcharging an unknown Ni-MH. This is normal behaviour on the first one or two charges. Let the device complete its full self-test after each charge cycle; by the second or third full charge the IC will have characterised the cell and the indicator will advance to 100% normally.

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