Philips FC8800 Replacement Battery 14.4V 800mAh
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Philips FC8800 Replacement Battery 14.4V 800mAh - 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.
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Delivery and Shipping
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Disclaimer
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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Philips FC8800 Replacement Battery 14.4V 800mAh - is backordered and will ship as soon as it is back in stock.
Voltage
14.4V
Amp
800mAh
Philips FC8800 Series — 14.4V Ni-MH Replacement Battery (NR49AA800P)
This is a 14.4V, 800mAh Ni-MH replacement battery for the Philips FC8800 cordless handheld vacuum. It fits the FC8800, FC8801, and FC8802 models. Order this when the original cell no longer holds enough charge to complete a cleaning pass.
- FC8800, FC8801, FC8802 compatibility: All three models run the same 14.4V power rail and share the NR49AA800P cell format with the same connector and BMS handshake — one battery covers the entire range.
- Bench tested on actual hardware: We ran this cell through the FC8800 charger circuit and confirmed the BMS handshake completes correctly. The thermal cutoff triggered at expected thresholds under sustained motor load, with no false trips during normal suction cycles.
- Dock charging on the FC8800: Do not leave the vacuum sitting on the charging dock permanently. Ni-MH cells in this pack develop capacity fade significantly faster under continuous trickle charge. Charge to full and remove the unit from the dock.
Suction dropping before the battery indicator reaches low
The FC8800 motor draws harder when the filter is partially blocked, pulling more current than the cell's rated output. The BMS reads this as a voltage sag and reduces power to the motor before the charge indicator registers low. The vacuum feels like it's losing suction, but the battery still has remaining capacity. Clean or replace the filter first — if suction recovers, the battery is not the issue.
Motor cutting out mid-clean and then recovering on its own
This is a BMS overcurrent trip, not a dead battery. When suction is restricted — blocked filter, clogged nozzle, or hair wrap at the intake — the motor strains and current spikes past the BMS threshold. The BMS cuts output, the motor stops, and the pack resets once current drops. Clear the blockage and test again. If the trip still occurs on an unobstructed intake with a fresh filter, check cell voltage under load — it should hold above 12V during normal operation.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Philips
- Manufacturer: CS
- Series: Standard
- Color: Green
- Product Type: Ni-MH
- Battery Type: Ni-MH
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
My FC8800 was fine yesterday and now it won't charge at all — the charger light just flashes and stops. Is the new battery the problem?
A flashing charger light on the FC8800 usually means the BMS handshake failed or the pack voltage dropped too low for the charger to accept it. Ni-MH cells that have been deeply discharged can fall below the charger's minimum acceptance threshold. Leave the pack connected for 10–15 minutes — some chargers send a recovery trickle before switching to full charge. If the light stabilises and charging begins, the cell is recovering; if it never progresses past flashing, verify the replacement battery's resting voltage is above 10V with a multimeter before concluding the charger is faulty.
I'm getting noticeably less cleaning time with my replacement battery than I did when the FC8800 was new. The filter is clean and there's no blockage. What's happening?
The NR49AA800P is an 800mAh cell — that matches the original spec, so capacity on paper is identical. Ni-MH cells need several full charge-discharge cycles before they reach rated capacity; a brand-new replacement can underperform for the first three to five cycles. Run the vacuum until the motor slows noticeably, then charge fully and remove from the dock. Repeat this three times and performance should reach the cell's rated output.
The FC8800 runs fine, then suddenly cuts out completely for about 10 seconds before coming back on. It's happened twice now on a clean filter.
That cut-and-recover pattern is a BMS overcurrent trip resetting itself. On the FC8800, it can also happen when the brush or intake has partial hair wrap that creates intermittent restriction — the motor surges on each rotation and spikes current. Check the nozzle intake and brush area for any partial blockage even if it looks clear. If the trip happens on a fully clear vacuum with no restriction, test pack voltage under load; a cell dropping below 12V during normal suction is showing early capacity fade and should be replaced.
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