Prolong Battery Discharger

Prolong Battery Discharger

(1 customer review)


Prolong Battery Discharger is an automated NiMh hybrid battery discharger with automatic amperage step-down and self shut-off at end of discharge cycle.


The Prolong® Battery Discharger is an innovative new automated hybrid battery discharging device.  It features 1.5A-200mA auto tapering NiMh Hybrid battery discharging, delivering 1.5A load to the battery pack while in the battery’s normal operating range.   As the battery drains below the normal operating range the load is reduced first to 0.5A then again to 0.2A to protect the battery from damage during deep discharge.  It has three user selectable discharge termination voltage options, allowing you to simply set the desired minimum voltage, press start, and walk away.  It will safely drain the battery pack to the desired voltage then turn itself off and sound an audible alert when finished.  The Prolong Battery Discharger has multiple safety systems including thermal protection and excess voltage protection to protect itself and your hybrid battery.

KEY FEATURES: 1.5A-200mA auto tapering NiMh Hybrid battery discharging

Three discharge termination options:  Pack discharging to an average value of 0.8V/cell, 0.5V/cell, and 0.1V/cell

Audible alert when discharge finished (can be turned off if desired)

Compatible with all Prolong Battery Systems Discharge Ready Car Harnesses

Universal AC input.

Size: 7.5″ x 7.5″ x 3.5″.  Car Harness sold separately.

Additional Information

Weight 110.4 oz
Vehicle Make

Chevrolet, Honda, Lexus, Toyota

Vehicle Model

1999 – 2003 Prius, 2000 – 2006 Insight, 2003 – 2005 Civic Hybrid, 2004 – 2009 Prius, 2004 – 2015 Prius, 2005 – 2007 Accord Hybrid, 2006 – 2011 Camry Hybrid, 2006 – 2011 Civic Hybrid, 2006 – 2013 Highlander Hybrid, 2006 – 2016 Camry Hybrid, 2006 – 2016 Highlander Hybrid, 2006 – 2016 RX400h, 2007 – 2012 GS450h, 2007 – 2013 Tahoe/GMC Yukon Hybrid, 2007 – 2017 GS450h, 2009 – 2014 Insight, 2010 – 2012 CR-Z, 2010 – 2015 Prius, 2011 – 2017 CT200h, 2012 – 2016 Camry Hybrid, 2012 – 2016 Prius c (Aqua), 2012 – 2016 Prius v, 2013 – 2017 GS450h, 2016-2020 Prius (NiMh only), 2019+ Corolla Hybrid

1 review for Prolong Battery Discharger

  1. 5 out of 5

    I bought a one-owner 2006 Honda Insight in 2018. When I replaced the no-name grid charger with a Hybrid Automotive Prolong charger in 2018, I also picked up the matching Discharger. Over the past three years I’ve been very happy with the unit – it provides several target voltages to choose from, and makes performing a discharge a snap. I just start the cycle and go do something else, checking in every few hours to see if it’s finished. The unit is well made, and feels very solid and reliable.

    The only thing I would change is an on/off switch for the alarm at the end of the discharge cycle. Since my driveway is next to the neighbor’s house, if the cycle ends in the middle of the night the noise may irritate them, especially in warmer weather when their bedroom windows are open…

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