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Rectangular lithium battery pack, matte finish, 52.95 by 35.1 by 4.5 mm

Estry

Estry standard battery 850 mAh for Siemens Gigaset SL785 SL788

SKU CH-7ZDB-4ECZ2

Replacement lithium battery delivering 850 mAh at 3.7 V for Siemens Gigaset SL785 and SL785 handsets

  • Battery pack size1-pack
  • Battery typeLithium
  • Battery capacity850 mAh
  • Battery voltage rating3.7
  • Product typeBatteries
  • Ready replacement for Gigaset SL785 and SL788 handsets
  • 850 mAh lithium cell restores original talk and standby time
  • Built-in protection guards against overcharge and short circuits
  • Compact 52.95 x 35.1 x 4.5 mm form fits the battery compartment
  • Certified to ISO 9001, RoHS, CE and UN 38.3 standards

Direct Replacement for Gigaset SL785 and SL788

This Estry lithium battery pack replaces the original 850 mAh cell used in Siemens Gigaset SL785 and SL788 handsets as well as the OpenStage SL4 professional phone. It matches the factory voltage of 3.7 V and delivers a rated capacity of 830 mAh for restored talk and standby time. The single-cell pack is built to the same 52.95 x 35.1 x 4.5 mm footprint and weighs 42.0 g.

Snap-In Installation With Built-In Safeguards

The pack slides into the handset battery compartment without tools; align the contacts and press until the latch clicks. Integrated protection circuitry guards against overcharge, over-discharge, over-voltage and short-circuit conditions, reducing the risk of swelling or sudden shutdown. The most common issue is purchasing the wrong variant — verify the handset model and the original part number such as 4250366817255 or S30852-D2152-X1 before ordering.

Steady Output During Long Calls

Under continuous use the cell maintains a stable 3.7 V rail with minimal voltage sag, supporting extended conversations without the rapid capacity drop seen in aged originals. The 3.07 Wh energy rating and certifications including ISO9001, RoHS, CE, UN38.3 and MSDS confirm consistent manufacturing quality. It is not suited for devices requiring a higher capacity pack or a different form factor.

How it compares

Measured against everything we stock in Household Batteries & Chargers, at today’s prices. Recalculated every night.

Price $10.99
Typical for this category: the median of 10,440 items is $10.99.

Specifications

Product
Brand nameSiemens
Product typeBatteries
Power
Battery typeLithium
Battery capacity850 mAh
Battery voltage rating3.7
In the box
Battery pack size1-pack

Questions about this item

How can I verify the Estry battery is working correctly after installing it in my Siemens Gigaset SL785?

After fitting the 3.7 V, 850 mAh lithium pack, the handset should power on immediately and show a full charge indicator. Make a test call; clear audio and stable signal confirm the cell is delivering its rated 3.07 Wh capacity.

What comes in the package and is anything else needed for the SL788?

The box contains one Estry lithium battery pack measuring 52.95 × 35.1 × 4.5 mm and weighing 42.0 g. No charger, tools or additional parts are included; the original handset cradle charges the cell directly.

Which version matches the original part number S30852-D2152-X1 for the OpenStage SL4 professional?

This Estry replacement is built to the exact specifications of part numbers S30852-D2152-X1, V30145-K1310-X444 and 4250366817255, so it fits the OpenStage SL4 professional and Gigaset SL785/SL788 models listed.

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