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16109Re: [RoboMower] Possible battery issue? - RL1000

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  • David Christopher
    Jun 16, 2009
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      Thanks Danny. I have emailed FriendlyRobotics support but heard nothing
      back yet. You'll have to excuse me, I'm a bit slow on these technical
      voltage discussions -- not my area of expertise at all. :-) Are there any
      specific things you think I can look at or try to do? Or does it sounds
      like I need something new (power pack, something malfunctioning in the
      charging base, etc). I did open the battery pack and the actual battery
      connections look fine, from what I can tell.

      I'm having to mow the lawn with my tractor - which is unheard of with a
      robot sitting there doing nothing! :-)


      On Mon, Jun 15, 2009 at 4:54 PM, Danny Miller <dannym@...> wrote:

      > YES. There is an issue.
      > That is the UNLOADED voltage that the charger puts out. An operational
      > battery electrically connected to the charger would drag the voltage
      > down to probably 28.4v as an absolute maximum when fully charged.
      > Normally, I'd expect that starting from a battery at 23.1v, putting it
      > on a charger would yield a voltage in the 24v range at first and the
      > voltage will gradually rise to the 28v range over a course of hours.
      > Either the battery has a bad connection from the batt to the charging
      > contacts, or there is a bad connection inside the pack, or there's a
      > problem inside the charger itself. Or the battery could be bad, that is
      > normally the case, but since you replaced them I would tend to discount
      > this possibility.
      > Danny
      > David Christopher wrote:
      > > Thanks for the help guys -- I will check all the connections, steel
      > > connectors, etc -- have not done so yet. I also (unfortunately) don't
      > have
      > > a voltmeter, so I will go pick one up at Radioshack hopefully today.
      > >
      > > In the meantime, I did just look at what the controller said (while the
      > > mower was still docked) -- it said:
      > >
      > > Battery Voltage: 23.1
      > > Charging Voltage: 33.6
      > >
      > > Do either of these numbers indicate any issue?
      > >
      > > Thanks
      > > Dave
      > >

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