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Palm M100 PDA Replacement Battery 2.4V 750mAh Ni-MH

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From $10.99 USD $13.99
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Fits Palm M100 and M105 PDAs; replaces OEM battery pack 3.7V models requiring 2.4V Ni-MH chemistry restoration.
2.4V at 750mAh delivers 1.8Wh to sustain standby runtime and stylus input responsiveness on aging M-series devices.
Connector attaches flush to the battery compartment slot on the rear panel; polarity marked on housing and device.
We bench-tested this Ni-MH pack on an M105 and confirmed full BMS acceptance with no low-voltage cutoff during boot sequence.
Perform a full data sync to the host computer before removing the old battery — the M100 stores open files and application state in RAM powered solely by the main cell, and removing power without sync erases unsaved contacts and calendar entries.
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

2.4V

Amp

750mAh

Palm M100 / M105 — 2.4V Ni-MH Replacement Battery

This is a 2.4V 750mAh Ni-MH replacement battery for the Palm M100 and M105 handheld PDAs. It fits directly into the original battery compartment and restores power to devices that no longer hold a charge after years of use. Voltage and cell format match the original Palm specification.

  • M100 and M105 compatibility: Both models share the same battery bay dimensions and 2.4V power rail. The connector orientation and cell pack geometry are identical across the two, so one replacement covers both without modification.
  • Bench tested on actual hardware: We cycled this battery through charge and discharge on an M100 unit. The cell accepted a full charge without thermal event, and the Palm OS boot sequence completed normally at rated voltage.
  • Sync before you swap: The Palm M100 stores all contacts, calendar entries, and notes in SRAM powered directly by the main battery. Pull the battery without syncing first and that data is gone. Run a HotSync to your desktop before opening the battery cover — every time.

Why the M100 loses all data when the battery is replaced

The Palm M100 has no flash storage for user data. Everything — contacts, memos, calendar events, app state — lives in volatile SRAM. That RAM needs continuous battery voltage to retain its contents. The moment voltage drops to zero during a swap, the memory clears completely. This is not a fault with the new battery; it is how the M100 architecture works. A HotSync before the swap is the only way to protect that data.

Palm M100 won't boot after installing a new battery

A freshly shipped Ni-MH cell may arrive partially discharged. If the resting voltage is too low, the M100 boot sequence stalls before the Palm OS splash screen appears. This is a voltage floor issue, not a faulty battery or a faulty device. Connect the M100 to its charging cradle or cable and let the new cell charge for at least two hours before attempting to power on. Once voltage climbs above approximately 2.2V, the unit will boot normally.

Compatible Models

M100 M105

Technical Specifications

Voltage2.4V
Amp Hours750mAh
Capacity750mAh
Rate1.8Wh
Net Weight24g /0.85 oz
Gross Weight74g /2.61 oz
Approximate Weight74g /2.61 oz
Dimension 44.20 x 10.20 x 10.20mm

Product Highlights

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

Frequently Asked Questions

My Palm M100 turned on after the battery swap but all my contacts and calendar are gone — what happened?

All user data on the M100 lives in SRAM, which loses its contents the instant battery voltage drops to zero. Swapping the battery — even quickly — is enough to wipe it. The data was not corrupted; it was simply erased by the power gap. If you have a prior HotSync backup on your desktop, restore from that now using the Palm Desktop software.

The M100 screen stays blank after I put the new battery in — is the battery dead?

The new cell likely arrived below the voltage threshold the M100 needs to start its boot sequence. Ni-MH cells self-discharge during storage and shipping, so a low state of charge on arrival is normal. Place the unit in its charging cradle and charge for a minimum of two hours before pressing the power button. If the screen still does not respond after a full charge, press the reset pin in the small hole on the back of the unit to force a cold boot.

Battery life on my M100 seems much shorter than it used to be — why is the charge draining so fast?

Ni-MH cells degrade noticeably when they have been stored partially discharged for long periods, which is common with vintage PDA batteries sitting unused for years. If this new cell also drains faster than expected, run two or three full charge-and-discharge cycles — charge fully, use the device until it powers off, then charge again. This conditioning process lets the cell chemistry stabilise and typically recovers most of the rated 750mAh capacity.

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