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Old 01-12-2011, 05:31 AM   #18
Ground Loop
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Join Date: Dec 2003
Location: San Diego, California, USA.
Posts: 517
5 yr Member
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Correct. I dare not use the Magnetek external or the Segway internal chargers with these batteries -- I'm certainly it would blow them up with a NiMH charge profile.

I'm removing the battery cases from the Segway, and then removing the 3S Lipo's from the batteries to charge on a bench... that's 12 3S batteries, for anyone keeping track.


As you know, the Segway effectively has four strings of NiMH batteries, two in each battery pack. Each string is made up of three 10-cell strings.
So for one voltage rail the Segway has 10+10+10, four times.
It *does* monitor the voltage of each of those 10-cell strings, so I can't spoof it by replacing all three with one large battery pack.

Instead, I have 3S + 3S + 3S in LiPo, each one replacing a string of 10 NiMH.

I would very much like to try "3S + 4S + 3S" to see if the Segway complains about inequality, or abuses the 4S pack, or just corrects the battery gauge.

Given the discharge curve of LiPo, I'm not all that concerned with the low battery bars, since it will just park at "two bars" for most of the useable range.
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