Fujitsu PA3553 CMOS Backup Battery 3V 200mAh Lithium
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Fujitsu PA3553 CMOS Backup Battery 3V 200mAh Lithium - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
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
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.
Disclaimer
Disclaimer
⚠️ 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.
Fujitsu PA3553 CMOS Backup Battery 3V 200mAh Lithium - is backordered and will ship as soon as it is back in stock.
Voltage
3V
Amp
200mAh
Fujitsu PA3553 / Amilo D7800 — 3V Lithium CMOS Backup Battery
This is a 3V, 200mAh lithium CMOS backup battery for Fujitsu Lifebook and Amilo systems, including models PA3553, MS2242, PA3515, and the Amilo D7800. It powers the RTC circuit and SRAM when the main battery is removed or the system is unplugged. Without it, the clock resets and BIOS settings are lost every time mains power is cut.
- PA3553, MS2242, PA3515, Amilo D7800 compatibility: These models share the same motherboard RTC circuit footprint and connector spec — the CMOS cell connects via a two-wire lead to a dedicated retention rail that operates independently of the main battery.
- Bench tested on actual hardware: We confirmed the cell holds above the 2.8V retention threshold under continuous SRAM load and that the connector seats correctly without modification to the socket spring.
- After-install BIOS step: After fitting the new cell, enter BIOS immediately, set the correct date and time, then save and exit. The RTC circuit resets to a default value after any power interruption — it will not self-correct and must be set manually after the swap.
BIOS clock resetting to 2000 after every power cycle
The RTC on these Fujitsu boards draws from the CMOS cell continuously, even when the laptop is fully powered off. Once cell voltage drops below 2.8V, the retention rail can no longer hold the RTC register state. The clock falls back to the factory epoch — typically 1 January 2000 — on every cold boot. Replacing the cell and setting the correct time in BIOS resolves this immediately; no firmware flash or BIOS reset is needed.
CMOS checksum error appearing on boot after cell swap
A checksum error on first boot after replacing the CMOS cell means the BIOS compared stored settings against what the SRAM now holds and found a mismatch — the old depleted cell left corrupted or zeroed values in SRAM. This is expected, not a sign the new cell is faulty. Enter BIOS, load optimised defaults, set the correct date and time, then save and exit. The error will not reappear once valid settings are written back to SRAM.
Compatible Models
Technical Specifications
Product Highlights
- Brand: Fujitsu
- Manufacturer: CS
- Series: Standard
- Color: Black
- Product Type: Lithium
- Battery Type: Lithium
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
The clock on my Fujitsu keeps showing 1 January 2000 every time I unplug it — is the new cell dead already?
No — a new CR-type lithium cell ships at storage voltage, which can read slightly below 3.0V until it's under load. What you're seeing is the RTC falling back to its default epoch because the SRAM lost power during the swap. Enter BIOS, set the correct date and time, save and exit. Once valid values are written to SRAM and the new cell is seated, the clock will hold through power interruptions.
My Fujitsu Lifebook throws a CMOS checksum error on every boot even after I fitted the replacement cell — what's wrong?
The checksum error means the BIOS found a mismatch between the stored configuration and what the SRAM now contains — common after a fully depleted cell leaves zeroed or corrupted values behind. The new cell itself is not the problem. Boot into BIOS, load optimised defaults, re-enter your date and time, then save and exit. The error clears permanently once the BIOS writes a fresh valid checksum to SRAM.
The replacement cell is seated but the connector feels loose — the spring doesn't seem to grip it the way it did the old one.
The contact spring on these Fujitsu motherboards can flatten or oxidise from sitting against a depleted cell for extended periods. Check the spring tab with a fine flathead — gently lever it back toward vertical so it makes firm contact with the cell terminal. If the terminal face shows white oxidation, clean it with a dry cotton swab before re-seating. After re-seating, confirm cell voltage reads above 2.8V at the connector pins before closing the chassis.
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