The standard "smart" chargers are inexpensive but not very
smart. If the batteries are really dead they will refuse to try. In that
case you can *VERY CAREFULLY* use a bench power supply with meters and
connect to the + and - sides of the power input connector (use the
charger wire colors for reference) and there is a large + on the trackbot
board. Start at 6 volts with no more than 500 mA of current. Increase the
voltage gradually to about 7 volts, keeping current under 500 mA. The
current will taper off unless the cells are damaged (in which case it's
time for a new battery).
Then after this "rejuventation" which takes only a few minutes,
the charger should work.
Leaving the charger connected overnight may also trickle charge them
enough to rejuvenate them.
Always remove the battery connection jumper JP6 before storing for more
than a day. Batteries will last 12 months or more if
Thanks for using TrackBot!
Time is the quality of nature that keeps
events from happening all at once. Lately it doesn't seem to be working.