CyberPower CP1000PFCLCD battery teardown
Also Sold As / Retail Channel Equivalent: CP1000PFCLCDTAA Same OEM manual or cartridge listing.
- Bare cells needed
- 1 x 12 V 9 Ah
- Max DC draw
- 61.0 A
- OEM cartridge
- RB1290
- Cell size
- 151 x 65 x 94 mm
- In inches
- 5.94 x 2.56 x 3.70 in
- Terminal
- F2 check yours
- Rating
- 1000 VA / 600 W
- Topology
- Line Interactive
- Waveform
- Pure Sine Wave
- Transfer time
- 4 ms typical
- OEM list price
- $55
- DC bus
- 12 V
- Last verified
- 2026-11-01
- LiFePO4 at full load
- RED
What battery does the CP1000PFCLCD actually use?
The CP1000PFCLCD uses RB1290, which holds one 12 V block rated 9 Ah on a 12 V DC bus. It fits a 151 x 65 mm bay with F2 terminals. This model has no serial-number split that we could find.
| Spec | Value | Source |
|---|---|---|
| VA and watts | 1000 VA / 600 W | T1 cyberpowersystems.com |
| Topology | Line Interactive | T1 cyberpowersystems.com |
| Waveform, in the OEM's words | Sine Wave | T1 cyberpowersystems.com |
| Transfer time | 4 ms typical | T1 cyberpowersystems.com |
| OEM cartridge | RB1290 | T1 cyberpowersystems.com |
| OEM list price | $55 | T1 cyberpowersystems.com |
CyberPower lists 151 x 98 x 65 mm. Full RB1290 teardown
How many DC amps does the CP1000PFCLCD pull?
At its full 600 W rating, the CP1000PFCLCD pulls about 61.0 A from its 12 V bus, and about 69.7 A as the battery sags to 10.5 V cutoff. Those figures assume 82% inverter efficiency, because CyberPower doesn't publish one for battery mode.
| AC load | Nominal | At cutoff |
|---|---|---|
| 25 W | 2.5 A | 2.9 A |
| 60 W | 6.1 A | 7.0 A |
| 100 W | 10.2 A | 11.6 A |
| 200 W | 20.3 A | 23.2 A |
| 300 W | 30.5 A | 34.8 A |
| 600 W | 61.0 A | 69.7 A |
Is LiFePO4 safe in the CP1000PFCLCD?
A 12 A BMS limits the CP1000PFCLCD to about 118 W, well below its 600 W rating. At full load the verdict is RED. A single block avoids series balance drift, so light loads suit LiFePO4. Drag the slider below to test your own load.
RED: BMS trip hazard
- DC draw now
- 25.4 A
- At 10.5 V cutoff
- 29.0 A
- Safe AC load
- 118 W
CP1000PFCLCD: lead-acid anchored to OEM half and full-load runtimes, LiFePO4 on a flat energy curve with inverter tare, at 82% inverter efficiency. A real inrush can trip a BMS below this ceiling. RB1290 teardown.
| BMS continuous | Safe AC load | Share of 600 W |
|---|---|---|
| 10 A | 98 W | 16% |
| 12 A | 118 W | 20% |
| 15 A | 148 W | 25% |
| 20 A | 197 W | 33% |
How long will the CP1000PFCLCD run on each battery?
CyberPower publishes about 6 min at 300 W and 2 min at 600 W on the stock cells, and our curve passes through both points. The 12V 9 Ah high-rate AGM option adds runtime in the same case. Drag the slider for your own load.
| AC load | Stock 9 Ah | 12V 9 Ah high-rate AGM | LiFePO4 10 Ah |
|---|---|---|---|
| 25 W | 1.9 hr | 2.1 hr | 2.5 hr |
| 60 W | 40 min | 47 min | 79 min |
| 100 W | 22 min | 26 min | 51 min |
| 200 W | 9.7 min | 12 min | 0 min, BMS trip |
| 300 W | 6.0 min | 7.7 min | 0 min, BMS trip |
| 600 W | 2.0 min | 2.7 min | 0 min, BMS trip |
| Load | CyberPower published | Raw Peukert | This site | Source |
|---|---|---|---|---|
| 300 W | 6 min | 8.3 min | 6 min | T1 cyberpowersystems.com |
| 600 W | 2 min | 3.7 min | 2 min | T1 cyberpowersystems.com |
Upgraded AGM scales from the anchored curve, with k = 1.18 standard and 1.12 high-rate. LiFePO4 uses a flat energy curve with inverter tare. Method.
Which replacement should you buy for the CP1000PFCLCD?
There are three routes for the CP1000PFCLCD. Path A swaps in one bare cell and reuses your harness. Path B adds LiFePO4 for loads under 197 W, by the listing's 20 A claim. Path C replaces the whole UPS, which makes most sense for units over six years old.
| Path | Best for | Load limit | Main risk |
|---|---|---|---|
| A: bare SLA swap | Lowest cost, any load | 600 W | Terminal or case mismatch |
| B: drop-in LiFePO4 | Light loads, long life | 197 W on the listed 20 A | BMS trip, charger mismatch |
| C: native LiFePO4 UPS | A unit over 6 years old, or high loads | 800 W | Slower transfer than this UPS |
Path A: the bare-cell SLA swap
Surge-safe, because AGM has no BMS to trip.
Path B: drop-in LiFePO4
Safe to about 197 W if the listing's 20 A BMS is continuous, or 118 W at 12 A. Check your load before you click.
Path C: a native LiFePO4 UPS
Worth it if this UPS is 6 or more years old, if a fault above isn't a battery problem, or if you need more than the BMS limit. Listings and reviews put Goldenmate's transfer at 8 to 20 ms, against this unit's 4 ms typical, so check that your PC tolerates it.
How do you move the CP1000PFCLCD harness to bare cells?
You move the factory leads from the old block to the new one, in the same polarity. Unplug the UPS first, and tape each lead as it comes off, because the battery stays live. Sealed sleds must be opened first. No soldering is needed.
- Shut down the load, turn the UPS off and unplug it from the wall.
- Take a photo of the wiring. Open the battery door or sled and slide the pack out.
- Pull the red clip off the positive tab, and tape it straight away.
- Remove the black lead and tape it.
- Check the new cell has the right size and tabs, then add any adapters from the parts list.
- Fit the leads one at a time, matching your photo, and remove the tape only from the lead you are fitting.
- Slide it back, plug in and charge for the time the manual gives before relying on it.
- Recycle the old cell at a battery retailer. Never bin lead-acid.
Sixty seconds is the best case for a loose-cell unit. Sealed sleds need opening first, and opening them may affect your warranty and CyberPower's equipment guarantee.
How much do you save over the RB1290?
RB1290 lists at $55, and one bare cell costs about $34.94 at a non-Amazon single-unit price, saving roughly 36%. That reference is a premium CSB block from one store, so cheaper brands may save more. Check Amazon for its current price.
| Item | Price | Source |
|---|---|---|
| Official RB1290 MSRP | $55 | T1 cyberpowersystems.com |
| Typical Commodity Bare-Cell Band (Non-Amazon Reference): 1 x CSB HR1234WF2 | $34.94 | T2 batterystore.com |
| Saving when you reuse the harness | $20.06 (36%) | computed |
What do the CP1000PFCLCD alarms and fault codes mean?
CyberPower CP1000PFCLCD user manual lists 5 signals we track for the CP1000PFCLCD. Only 0 of them point to the battery, and 4 mean you should not buy batteries yet. Read your signal below first, because a new battery won't fix a charger, a relay or an overload.
| Signal | Meaning | What to do | Battery swap? | Source |
|---|---|---|---|---|
| E01 | Charger fault, overcharge | Contact CyberPower. New batteries won't fix a charger. | Do not buy batteries | T1 manual |
| E02 | Charger fault, no charge | Contact CyberPower. New batteries won't fix a charger. | Do not buy batteries | T1 manual |
| E11 | Battery overvoltage | Contact CyberPower. | Do not buy batteries | T1 manual |
| E21 | Output short | Check connected equipment, then restart. | Check first, then decide | T1 manual |
| E22 | Overload | Unplug at least one item, then restart. | Do not buy batteries | T1 manual |
How do you reach the battery in the CP1000PFCLCD?
On the CP1000PFCLCD, the manual says: screw panel: retaining screws on the bottom. Inside there is one battery of about 151 x 65 mm. Check the details below before you start, turn the unit off and unplug it first, and photograph the wiring so you can match it later.
| Field | Value | Source |
|---|---|---|
| Battery door access | Screw panel: retaining screws on the bottom | T1 manual |
| Cell orientation | Not stated in the manual we captured | same manual |
| Harness connector type | Red and black wires to same-color connectors on the battery | same manual |
| Cell layout | 1 x 12 V, single block | verified |