Powered by EnduraLife? Battery Technology
Models G138, G124, G125, G126

MOMENTUM? X4 CRT-D product image

Introducing the Resonate? family of ICDs and CRT-Ds, offering an extraordinary, holistic approach to cardiac care.

Key Resources



Product Details

Models G138, G124, G125, and G126

  • HeartLogic? Heart Failure Diagnostic for detecting indications of worsening heart failure status.
  • SmartCRT? is Boston Scientific’s approach to personalize CRT therapy by providing physicians with smart solutions to optimize, where, when, and how to pace.
  • EnduraLife? Battery Technology provides more power to use more of the device, featuring projected longevity up to 13.3 years projected longevity with MultiSite Pacing turned on.*

* Assumes: 2.0V RA, LV-only, 2.0V LV, 700Ω, 15% A pacing, 100% LV pacing, No LATITUDE, No Respiratory, Rate Sensor, No Heart Failure Sensor Suite.

Mechanical Specifications

Model Type Size (cm)
(W x H x D)
Connector Type
G138 X4 CRT-D 5.37 x 8.08 x 0.99 73.4 32.0 RA: IS-1; RV: IS-1/DF-1; LV: IS4 C1882
G124 CRT-D 5.37 x 8.18 x 0.99 73.6 32.5 RA: IS-1 ; RV: DF4; LV: IS-1 C1882
G125 CRT-D 5.37 x 8.08 x 0.99 72.8 32.0 RA: IS-1; RV: IS-1/DF-1; LV: IS-1 C1882
G126 CRT-D 5.37 x 8.08 x 0.99 72.9 32.0 RA: IS-1; RV: IS-1/DF-1; LV: LV-1 C1882

Longevity Information

EnduraLife Battery Technology provides clinically-proven, industry-leading projected longevity.1-10 The following tables represent sample pulse generator life expectancy estimation (implant to explant) with EnduraLife battery as provided in product labeling. For specific programmable parameter ranges, refer to product labeling at, or contact Boston Scientific technical services or your local representative.
Projected longevitya Ventricular
RA/RV LV LVbd 500Ω with
700Ω with
RS, or HFSSc
MultiSite Pacing Off
Typical programmed setting BiV 2.5 V 3.0 V Off 9.7 10.5 11.3
Maximum labeled longevity LV-Only 2.0 V / Off 2.0 V Off 12.9 13.2 14.7
MultiSite Pacing On
Typical programmed setting BiV MSP 2.5 V 3.0 V 3.0 V 8.2 9.1 9.7
Maximum labeled longevity LV-Only MSP 2.0 V / Off 2.0 V 2.0 V 11.5 12.1 13.3
  • Assumes 70 PPM LRL; DDDR mode; 0.4 ms Pulse Width (RA, RV, LV); sensors On, Heart Failure Sensor Suite On.
  • Projected longevity is calculated assuming 2 maximum energy charging cycles per year, including automatic capacitor re-forms and therapeutic shocks. These calculations also assume 3-channel EGM Onset is on and that the pulse generator spends 3 months in Storage mode during shipping and storage.

a. Assumes ZIP telemetry use for 2 hours at implant and for 40 minutes annually for in-clinic follow-up checks.

b. Assumes standard use of the LATITUDE? Communicator as follows: Daily Device Check on, quarterly scheduled remote follow ups, and other typical interrogations.

c. Assumes LATITUDE? Communicator is not used, Respiratory Sensor is Off, and Heart Failure Sensor Suite is Off.

d. Applies to models with MultiSite Pacing (MSP).

Additional Longevity Information

  • Boston Scientific devices have corporate warranties at 6 years in available geographies. Warranty information available at
  • Devices use Li/MnO2 chemistry.
  • The Usable Battery Capacity is 1.9 Amp-hours (typical implant to battery capacity depleted).
  • Shelf life is 2 years (before use by date).

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