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Siemens Gigaset SL78H Compatible Battery 3.7V 830mAh Li-ion

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Fits Siemens Gigaset SL78H, SL780, SL785, SL788 and replaces OEM part numbers V30145-K1310K-X444, V30145-K1310-X445, S30852-D2152-X1.
3.7V lithium-ion at 830mAh delivers the charge capacity this handset needs for standard daily use cycles.
Connector slides into the battery compartment under the handset grip; polarity marked on the pack itself.
We bench-tested this cell in an SL78H unit; the BMS accepted the voltage profile without cutoff errors on insertion.
After installation, seat the handset fully in the base station and let it charge for 16 hours before first talk use.
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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

3.7V

Amp

830mAh

Siemens Gigaset SL78H / SL780 Series — 3.7V Li-ion Replacement Battery (V30145-K1310-X444)

This 3.7V, 830mAh (3.07Wh) Li-ion battery replaces the factory pack in the Siemens Gigaset SL78H cordless handset and its close variants. It fits the SL780, SL785, and SL788 alongside 30 additional Gigaset models sharing the same form factor and connector. Voltage and physical dimensions match the OEM specification exactly: 52.95 × 35.10 × 4.50mm.

  • SL78H / SL780 / SL785 / SL788 compatibility: These handsets share the same 3.7V single-cell rail, identical JST-style connector, and a BMS that accepts the same charge termination voltage. A battery from any one of these models will seat and communicate correctly in the others.
  • Bench tested on actual hardware: We cycled this pack through charge and discharge on the SL78H handset. The BMS accepted the charge curve without tripping an error, and the base station cleared its charge indicator light as expected on each run.
  • First-charge protocol for DECT handsets: Place the handset in the base immediately after fitting this battery and leave it there for a full 16 hours before first use. Li-ion cells shipped in storage state need that initial slow charge to register correctly with the handset's fuel gauge circuit.

Talk time shorter than the original battery after replacement

This is normal for the first three to five cycles. The handset's fuel gauge calibrates itself against actual charge and discharge data, and a new cell needs several full cycles before that calibration is accurate. Until then, the gauge may cut off the handset early even if residual charge remains in the cell. Run three complete charge-to-cutoff cycles in normal use and the reported capacity will stabilise at the rated 830mAh.

Base station showing no charge light after fitting the new battery

A battery shipped in storage state can sit below the acceptance threshold the base station uses to begin its charge cycle — typically around 3.0V for a single Li-ion cell. The base sees a voltage it does not recognise as a flat-but-healthy cell and withholds current. Seat the handset firmly in the base, then leave it undisturbed for 30 minutes. If the charge light still does not appear, remove the handset, wait 10 seconds, and reseat it — this resets the base's detection circuit and usually clears the issue.

Compatible Models

Gigaset SL78H Gigaset SL780 Gigaset SL785 Gigaset SL788 Gigaset SL400 SL78 SL78H SL780 SL785 SL788 SL400 SL400H SL400A Gigaset X656 OpenStage SL4 Gigaset SL400H Gigaset SL610H Pro Gigaset SL78 OpenStage SL4 professional Gigaset SL400A Gigaset SL750 Gigaset SL750H OpenScape SL5 professional S30852-S2352-R141 L30250-F600-C230 Gigaset SL450HX Gigaset SL610H Gigaset SL350H Gigaset SL450H Gigaset SL450HX. Gigaset SL780H Gigaset SL785H Gigaset SL800H Unify SL4 Unify SL5

Replaces Part Numbers

V30145-K1310K-X444 V30145-K1310-X445 S30852-D2152-X1 4250366817255 V30145-K1310-X444

Technical Specifications

Voltage3.7V
Amp Hours830mAh
Capacity830mAh
Rate3.07Wh
Net Weight17g /0.60 oz
Gross Weight42g /1.48 oz
Approximate Weight42g /1.48 oz
Dimension 52.95 x 35.10 x 4.50mm

Product Highlights

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

Frequently Asked Questions

My Gigaset SL78H pairs fine but the range dropped noticeably after fitting the new battery — why?

Range on a DECT handset is tied directly to RF transmit power, and transmit power draws a short, sharp current spike that a low or poorly calibrated cell handles badly. If the battery voltage sags under that RF load, the handset's transmit power drops to protect the cell, and range shrinks. Run three full charge-to-cutoff cycles so the cell reaches its rated 830mAh and the voltage holds more steadily under load — range should recover to normal after that.

The handset lost its pairing with the base when I swapped the battery — how do I get it back?

Removing the battery cuts power completely, and some Gigaset DECT handsets clear their pairing memory when power is fully lost. The base station stores the paired device list independently, so the fix is to re-register the handset rather than replace anything. On most SL-series bases, press and hold the paging button on the base for around 3 seconds to open the registration window, then follow the handset menu to re-register — the process takes under two minutes.

The handset is fully charged but drains completely overnight while sitting in standby — is the battery faulty?

This is a standby draw issue, not a capacity fault. The Gigaset SL78H draws a small but continuous current in standby to maintain DECT registration with the base, and if the handset is not properly seated in the charging cradle, it runs on battery the entire time rather than drawing from the base. Check that the handset clicks fully into the cradle and that the charge contact on the base is clean — a light wipe with a dry cloth removes oxidation that breaks the charging circuit. If seating is confirmed and the drain continues, check the base power adapter is delivering the correct output voltage.

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