12 Volt 18 Ah Sealed AGM Battery.
Acceptable brands include Duracell, UPG, Bright Way Group, Panasonic, Interstate, and others.
(The previous are registered trademarks of the respective companies.)
Length: 7.17 in
Width: 3.03 in
Height: 6.57 in
Voltage: 12
Lead Acid Type: Deep Cycle
Capacity: 18ah
Chemistry: Lead Acid
Lead Acid Design: AGM
Product Category: Sealed Lead Acid
Product Subcategory: Deep Cycle
Terminal Type:
•
M6 Nut and Bolt, NB, Nut, and Bolt.
To recover the battery pack or diagnose their condition:
•
Connect a twelve (12) Volt charger with a meter across the terminals of each battery, one
battery at a time.
•
If you get a reading of zero (0) volts, a short circuit has occurred, replace the battery.
•
If your battery reads less than 10.5VDC when charging, then the battery has a dead cell,
replace the battery
•
The battery charger indicates fully charged, but the voltage is below 12.4VDC? The
battery is sulfated, replace the battery soon.
Are all batteries fully Charged? The tug should be able to resume normal functions.
We suggest charging your tug when
the battery falls below around 70% (at
rest) for optimal battery life (for sure be-
fore 30% at rest). Note: The tug contin-
uously and instantaneously calculates
the state of charge, which is why the
percentage fluctuates while moving
your plane. We have seen as low as
a 10% charge displayed when using
a fresh battery and moving a heavy
plane. To read the resting battery’s
charge, leave the tug at rest for at least
60 seconds. We have seen a 10% drop
from freshly charged just by moving
the tug in and out of the hanger. The
discharge rate is non-linear.
If you notice shorter times needed
between charges, your batteries are
beginning to wear out.
Lead Acid batteries are surprisingly del-
icate—damaged by direct and indirect
effects: environmental, user induced,
misapplication, and on and on. For in-
stance, charging with a voltage above
14.4 volts or allowing the battery to
discharge completely are the two most
common ways to damage a lead-acid
battery.
You can ruin even new batteries that
are discharged too much or left un-
charged for too long in just a few
weeks; for this reason, Best Tugs cannot
warranty the batteries as we have no
control over the end-users’ actions.
Modern microprocessor-based smart
chargers use switching circuits; they are
lightweight and designed to protect
themselves against reverse polarity con-
nection. They also have an annoying
feature of not charging if the battery’s
voltage is below some arbitrary value.
If you left the tug on and it no longer
charges, a cheap 12-volt car charger
with a volt-meter is your best option to
try and restore the battery. Note: Most
local battery/automotive stores carry
replacement batteries.
Battery Care