Welcome to the online resource center and idea exchanging place for users of the Lee Hart/TMSI Battery Balancer kit!
The Battery Balancer is a system that keeps a set of batteries in an electric vehicle "balanced" by shuttling charge to the weaker/lower capacity batteries in the pack so that all batteries will all reach empty at about the same time when they are discharged, and full at about the same time when they are recharged.
The Battery Cycler is a device for testing a battery or cell by discharging it at a constant current and then recharging it. It measures volts, amps, and amphour capacity, at user-selectable current and voltage thresholds.
Site last updated: 16 Oct 2021
29 May 2021: Site relocated from Nook (RIP) to sunrise-ev.com
18 Feb 2012: Rev A & B overviews updated with links to images of assembled PCBs.
30 Nov 2010: Updated schematics posted for Rev B Balancer.
01 May 2010: Rev B Balancer schematics and overview updated.
10 Jan 2010: Updated schematics posted for Rev B Balancer.
06 Sep 2009: Site relocated from Geocities (RIP) and layout revamped.
09 May 2009: Cycler/Tester schematic updated.
04 May 2009: Cycler/Tester page updated.
05 Apr 2009: Schematic, and Intro pages updated with Rev B info. Cycler/Tester page added.
23 Apr 2007: Schematic, and Parts List pages updated.
22 Sep 2002: Intro, Schematic, and Control Software pages updated.
16 Aug 2002:
15 Aug 2002:
05 Aug 2002: Initial revision.