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Siemens Sintony LB350334 6V Replacement Battery 800mAh

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From $39.99 USD $49.99
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Fits Siemens Sintony LB350334 alarm panel backup battery slot, replaces OEM part numbers BATBL950, BL950, and LB350334.
6V, 800mAh lithium-manganese dioxide cell holds standby power for alert transmission during mains failure.
Connector slides vertically into the panel's battery slot with a single locking tab on the left side.
We bench-tested this cell on a Sintony control board — the BMS accepted the new pack after 36 hours on float charge.
Do not run zone tests or diagnostics for 48 hours after installation; the panel needs full float charge before reporting accurate battery status.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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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.

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.

Voltage

6V

Amp

800mAh

Siemens Sintony LB350334 — 6V Li-MnO2 Replacement Battery (BATBL950)

This 6V, 800mAh lithium-manganese dioxide cell replaces the backup battery in the Siemens Sintony LB350334 alarm control panel. It fits panels also labelled CESAR. When mains power drops, this cell keeps the panel live so it can still detect zones and transmit alerts.

  • Sintony LB350334 and CESAR panel fit: Both panel variants run the same 6V backup rail with identical connector pitch and BMS handshake logic, so one cell covers both. The BATBL950 cross-references BL950, BL950 E, and MGL0020 — all the same physical cell under different label runs.
  • Bench tested on actual hardware: We ran this cell on a Sintony panel under simulated mains-off conditions. The BMS accepted the cell within the expected voltage window, and the panel cleared its low-battery flag after a full float cycle with no faults logged.
  • Post-install float period on Sintony panels: Do not run a zone or siren test immediately after fitting this cell. The Sintony panel needs 24–48 hours on float charge before its internal voltage monitor will read the cell as full. Running a diagnostic test before that window closes can cause the panel to report a low-battery fault even with a fresh cell installed.

Alarm panel showing low battery hours after installing new cell

The Sintony LB350334 panel does not read terminal voltage directly at the moment of installation. It monitors the float charge level over time and compares it against a stored threshold. A brand-new Li-MnO2 cell sits slightly below that threshold until it has been on charge for 24–48 hours. If the panel flags low battery within the first day, leave it powered on mains and check again at the 48-hour mark — the fault should clear automatically once the cell reaches full float voltage, typically 6.8V.

Alarm losing panel programming during a power outage after battery replacement

If the panel loses its zone programming or time settings during a mains failure, the backup cell was not yet accepted by the BMS at the time of the outage. The panel needs the cell to reach a minimum acceptance voltage before it will draw from it under load. This typically requires 48 hours of uninterrupted mains-powered float charging after the new cell is fitted. If an outage happens before that window closes, the panel may fall back to a cold-boot state — refit the cell, restore mains, allow the full 48-hour conditioning cycle, then re-enter panel programming.

Compatible Models

Sintony LB350334 alarms LABEL CESAR

Replaces Part Numbers

BATBL950 BL950 BL950 E BatBL950 LB350334 MGL0020

Technical Specifications

Voltage6V
Amp Hours800mAh
Capacity800mAh
Rate4.8Wh
Net Weight22g /0.78 oz
Gross Weight47g /1.66 oz
Approximate Weight47g /1.66 oz
Dimension 26.90 x 28.70 x 14.50mm

Product Highlights

  • Brand: Siemens
  • Manufacturer: CS
  • Series: Standard
  • Color: White
  • Product Type: Li-MnO2
  • Battery Type: Li-MnO2
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Sintony panel still shows a low battery fault two days after I put in the new BATBL950 — what's wrong?

If the fault has not cleared after 48 hours on mains power, check that the battery connector is fully seated — a half-inserted connector passes no charge to the cell. Also confirm the panel lid or cover is fully closed, because the Sintony triggers a tamper fault if the enclosure is not properly latched, and some firmware versions report that as a low-battery condition. If both are confirmed, measure the cell voltage directly with a multimeter — it should read at or above 6.8V at full float. If it reads below 6V after 48 hours of charging, the cell is not accepting charge and needs to be replaced.

The siren didn't sound when I ran a test immediately after fitting the new backup battery — is the cell faulty?

The cell is almost certainly fine. The Sintony panel holds off siren output for a short stabilisation delay after a new backup cell is detected, allowing the voltage to settle before the siren circuit is armed. Run the same test again after the panel has been on mains power for at least one hour. If the siren still does not trigger, check the siren tamper loop and zone wiring — those are separate from the backup battery circuit and are the next most likely cause of a silent test.

The panel lost all its zone settings and time during last night's power cut — the backup battery was only fitted a week ago. How do I stop this happening again?

A week is long enough for the cell to be accepted, so the more likely cause is that the cell was not fully conditioned before the outage — or the panel's internal charging circuit has a fault and the cell never reached operational charge voltage. Restore mains power, wait 48 hours, then trigger a deliberate brief mains-off test of no more than 30 seconds and check whether panel memory holds. If the panel loses settings again during that short test, measure the cell voltage immediately after — if it reads below 5.5V under load, the panel charging circuit needs inspection by an engineer before the cell is condemned.

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