CyberPower PR1500LCD battery teardown
- Bare cells needed
- 2 x 12 V 17 Ah
- Max DC draw
- 76.2 A
- OEM cartridge
- RB12170X2A
- Cell size
- 181 x 76 x 167 mm
- In inches
- 7.13 x 2.99 x 6.57 in
- Terminal
- NB check yours
- Rating
- 1500 VA / 1500 W
- Topology
- Line Interactive
- Waveform
- Pure Sine Wave
- Transfer time
- 4 ms typical
- OEM list price
- $248
- DC bus
- 24 V
- Last verified
- 2026-11-02
- LiFePO4 at full load
- RED
What battery does the PR1500LCD actually use?
The PR1500LCD uses RB12170X2A, which holds two 12 V blocks in series rated 17 Ah on a 24 V DC bus. Each block fits a 181 x 76 mm bay with NB terminals. This model has no serial-number split that we could find.
| Spec | Value | Source |
|---|---|---|
| VA and watts | 1500 VA / 1500 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 | RB12170X2A | T1 cyberpowersystems.com |
| OEM list price | $248 | T1 cyberpowersystems.com |
CyberPower lists 152 x 175 x 181 mm for the pack, which is two 76 mm wide blocks side by side. CyberPower's spec table lists two batteries, although its overview text says one. Sellers of compatible sets list nut-and-bolt terminals. Full RB12170X2A teardown
A 151 x 65 mm F2 cell doesn't suit this bay and harness: terminal nb mismatch.
How many DC amps does the PR1500LCD pull?
At its full 1500 W rating, the PR1500LCD pulls about 76.2 A from its 24 V bus, and about 87.1 A as the battery sags to 21 V cutoff. Those figures assume 82% inverter efficiency, because CyberPower doesn't publish one for battery mode.
| AC load | Nominal | At cutoff |
|---|---|---|
| 25 W | 1.3 A | 1.5 A |
| 60 W | 3.0 A | 3.5 A |
| 100 W | 5.1 A | 5.8 A |
| 200 W | 10.2 A | 11.6 A |
| 300 W | 15.2 A | 17.4 A |
| 750 W | 38.1 A | 43.6 A |
| 1500 W | 76.2 A | 87.1 A |
Is LiFePO4 safe in the PR1500LCD?
A 12 A BMS limits the PR1500LCD to about 236 W, well below its 1500 W rating. At full load the verdict is RED. We could not verify a LiFePO4 pack that fits this bay and harness, so we link none. Drag the slider below to test your own load.
RED: BMS trip hazard
- DC draw now
- 12.7 A
- At 21 V cutoff
- 14.5 A
- Safe AC load
- 236 W
PR1500LCD: 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. RB12170X2A teardown.
| BMS continuous | Safe AC load | Share of 1500 W |
|---|---|---|
| 10 A | 197 W | 13% |
| 12 A | 236 W | 16% |
| 15 A | 295 W | 20% |
| 20 A | 394 W | 26% |
This pack uses nut-and-bolt terminals, and the LiFePO4 pack we checked has F1 tabs. So we show no drop-in link.
How long will the PR1500LCD run on each battery?
CyberPower publishes about 15.1 min at 750 W and 4.7 min at 1500 W on the stock cells, and our curve passes through both points. The 12V 18 Ah AGM nut and bolt option adds runtime in the same case. Drag the slider for your own load.
| AC load | Stock 17 Ah | 12V 18 Ah AGM nut and bolt | LiFePO4 10 Ah |
|---|---|---|---|
| 25 W | 13.4 hr | 14.2 hr | no verified pack |
| 60 W | 5.0 hr | 5.3 hr | no verified pack |
| 100 W | 2.7 hr | 2.9 hr | no verified pack |
| 200 W | 72 min | 77 min | no verified pack |
| 300 W | 45 min | 48 min | no verified pack |
| 750 W | 15 min | 16 min | no verified pack |
| 1500 W | 4.7 min | 5.0 min | no verified pack |
| Load | CyberPower published | Raw Peukert | This site | Source |
|---|---|---|---|---|
| 750 W | 15.1 min | 13 min | 15.1 min | T1 cyberpowersystems.com |
| 1500 W | 4.7 min | 6.0 min | 4.7 min | T1 cyberpowersystems.com |
Same footprint, 5.9% more rated capacity. 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 PR1500LCD?
There are three routes for the PR1500LCD. Path A swaps in two bare cells and reuses your harness. Path B is withheld, because no verified pack fits. 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 | 1500 W | Terminal or case mismatch |
| B: drop-in LiFePO4 | Light loads, long life | not offered | BMS trip, charger mismatch |
| C: native LiFePO4 UPS | A unit over 6 years old, or high loads | 1800 W | Slower transfer than this UPS |
Path A: the bare-cell SLA swap
Surge-safe, because AGM has no BMS to trip. 17 Ah and 9 Ah cells share the 151 x 65 x 94 mm case, so 9 Ah adds 5.9% rated capacity.
Path B: drop-in LiFePO4
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.
How do you move the PR1500LCD harness to bare cells?
You move the factory jumper and leads from the old blocks to the new ones, in the same polarity. Unplug the UPS first, and tape each lead as it comes off, because the battery stays live. This pack uses bolted terminals, so it needs a wrench. 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.
- Undo the bolted lead on the positive post first, and tape it straight away. Keep your wrench away from the other post.
- Remove the black lead and tape it. Then lift off the jumper between the cells, with any fuse your harness has.
- Check the new cells have the right size and tabs, then add any adapters from the parts list.
- Fit the jumper first, from the positive of one cell to the negative of the next. Fit the leads one at a time, matching your photo, and remove the tape only from the lead you are fitting.
- Measure about 25 to 27 V across the two outer leads before you close the pack. Slide it back, plug in and charge for the time the manual gives before relying on it.
- Recycle the old cells 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 RB12170X2A?
RB12170X2A lists at $248, and two bare cells cost about $120.94 at a non-Amazon single-unit price, saving roughly 51%. 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 RB12170X2A MSRP | $248 | T1 cyberpowersystems.com |
| Typical Commodity Bare-Cell Band (Non-Amazon Reference): 2 x CSB GP12170NB | $120.94 | T2 batterystore.com |
| Saving when you reuse the harness | $127.06 (51%) | computed |
What do the PR1500LCD alarms and fault codes mean?
We don't have an alarm table for the PR1500LCD, because the sources we captured don't include one. Rather than guess at what a beep means, check the manual that came with your unit before you buy a replacement battery or contact support.
We could not get this model's alarm table, so we list nothing rather than guess. Check the manual that came with your unit.
| PR1500LCD | Not captured |
|---|
How do you reach the battery in the PR1500LCD?
We have no verified door procedure for the PR1500LCD. CyberPower sells a replacement cartridge for it, but we did not capture the steps. Follow the manual for your unit, and don't open the case to find out how it comes apart. Contact the manufacturer if you are unsure.
| Field | Value | Source |
|---|---|---|
| Battery door access | No procedure captured. Treat as a service item | none |
| Cell orientation | Not stated in the manual we captured | none |
| Harness connector type | Not stated in the manual we captured | none |
| Cell layout | 2 x 12 V, in series | verified |