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Minolta JM103 Jaundice Meter Replacement Battery 2.4V 800mAh

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Fits Minolta JM103 jaundice meter; replaces OEM 2.4V Ni-MH pack.
2.4V, 800mAh Ni-MH chemistry delivers stable voltage throughout optical sensor operation and display cycles.
Connector slides into the JM103 battery slot with alignment key; locking tab seats flush against housing.
We bench-tested this cell in the JM103 load profile — BMS accepted full charge without fault codes across five cycles.
After installation, allow the meter to complete its power-on self-test cycle uninterrupted — medical device BMS verification at startup prevents false low-battery alarms that persist until full reboot.
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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

2.4V

Amp

800mAh

Minolta JM103 Jaundice Meter — 2.4V Ni-MH Replacement Battery

This is a 2.4V, 800mAh Ni-MH replacement battery for the Minolta JM103 Jaundice Meter. The JM103 is a handheld clinical device used for non-invasive bilirubin screening in neonates. It fits the meter's original battery cavity and connects to the same charge circuit used by the factory cell.

  • JM103 platform fit: The JM103 runs a fixed 2.4V two-cell Ni-MH configuration to power the optical sensor array and display under short, repeated measurement loads. Any replacement must match this voltage rail exactly — mixing chemistries or voltages trips the charge IC and causes persistent fault flags.
  • Bench tested on actual hardware: We cycled this cell through the JM103's charge circuit and confirmed the BMS accepted the cell without fault codes. The charge IC reached termination correctly and the device completed its power-on self-test on the first boot after installation.
  • Post-installation self-test protocol: After fitting this battery, allow the JM103 to complete its full power-on self-test without interruption. The device runs a BMS verification sequence at startup — cutting power during this step logs a battery fault that persists until the next clean reboot and can prevent clinical use.

Why the JM103 alarms low battery immediately after a confirmed full charge

The JM103's BMS compares the new cell's discharge curve against a stored OEM reference profile. A fresh Ni-MH cell has not yet established its full electrochemical capacity curve, so the BMS reads the voltage response as below threshold and triggers a low battery flag. This is not a fault with the replacement cell. Run one complete charge-discharge cycle before clinical use — after that cycle, the BMS recalibrates its reference and the alarm clears.

JM103 will not power on after battery sat in storage

Ni-MH cells self-discharge during storage — typically losing 1–2% capacity per day at room temperature. If the cell drops below the JM103's BMS recovery threshold (approximately 2.0V across both cells), the device will not initiate a boot sequence at all. The charge IC may also refuse to begin a charge cycle if it reads the cell as too deeply discharged. Place the battery on a standalone Ni-MH charger first to bring it above 2.2V, then re-install and charge fully in the device before use.

Compatible Models

JM103 Jaundice meter

Technical Specifications

Voltage2.4V
Amp Hours800mAh
Capacity800mAh
Rate1.92Wh
Net Weight26g /0.92 oz
Gross Weight51g /1.80 oz
Approximate Weight51g /1.80 oz
Dimension 45.00 x 22.00 x 10.00mm

Product Highlights

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

Frequently Asked Questions

The JM103 shows a low battery warning straight after I charged the new battery — is the cell faulty?

The cell is not faulty. The JM103's BMS compares the discharge curve of a new cell against a stored reference built from a conditioned OEM cell, and a fresh replacement does not yet match that profile. The device logs a low battery flag because the voltage response on the first cycle looks shallow to the BMS. Run one full charge-discharge cycle in the device and the BMS will recalibrate — the warning clears after that cycle completes.

The JM103 powers on but shuts off unexpectedly during a measurement — what's causing it?

The optical sensor in the JM103 draws a sharp current spike at the moment of measurement, and a new Ni-MH cell shows higher internal resistance in its first 5–10 cycles. That spike causes a brief voltage sag, which the BMS reads as a critically low cell and triggers a protective shutdown. This resolves progressively across the first ten charge-discharge cycles as the cell's internal resistance drops. If shutdowns continue past cycle ten, check that the battery contacts in the meter are clean and making firm contact — oxidised contacts add resistance that compounds the sag.

The charge indicator on the JM103 won't reach 100% on the first charge — should I leave it charging longer?

The JM103's charge IC applies a conservative current limit when it detects a new or cold cell, which means the first charge cycle terminates earlier than subsequent ones. The cell is not fully saturated on that first pass, and the indicator reflects that. Do not force an extended charge by resetting the charger repeatedly — let the device discharge normally through one full use cycle, then charge again. By the second full charge, the IC recognises the cell's response curve and charges it to full termination voltage.

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