Product Support Bulletin S/N A56A

Symptom
Possible Cause(s) Solution(s)
Battery Pack
connected to
Charger. Red
Charger light
flashing.
Battery Pack temperature is below 14ºF or between
150ºF and 194ºF
Faulty Battery Pack
This is normal. Charger is waiting for Battery Pack temperature to reach acceptable
range for charging. Charge will commence once temperature reaches proper range.
If Battery Pack is obviously in the acceptable temperature range - between 15ºF and
149ºF – and flashing red charger light persists, try known good battery pack on
charger.
Battery Pack
connected to
Charger. Green
Charger light
turns on almost
immediately.
Battery Pack was nearly fully charged at time of
connection to Charger
Faulty Battery Pack
This is normal. Charger does not charge a Battery Pack that is more than about 85%
fully charged.
If electronics of Battery Pack are damaged, Charger may receive a false signal that
Battery Pack is fully charged. Try charging Battery Pack on known-good Charger or
try Charging known-good Battery Pack on questionable Charger.
Battery Pack
connected to
Charger. Red
Charger light
turns on and a
“chirping” sound
is heard coming
from the
Charger.
Pack was depleted to a very low voltage This is normal. Charger will attempt to “recover” a deeply depleted Battery Pack.
Chirping sound is due to electronics inside the Charger. If Battery Pack does not
recover, Charger will flash red/green. In that case, make several attempts to charge
by removing/reinserting the Battery Pack. If it still does not go into normal charge,
Battery Pack is probably damaged.
Charger lights go
out after
charging for a
period of time.
Line voltage became too high or too low
Battery Pack was cold and/or Battery Pack has been
used for many cycles
Move Charger to more stable power. Remove/reinsert Battery Pack. If lights do not
turn on, unplug Charger for one minute and plug it back in.
Charging in cold weather can cause this effect to occur. This effect is more prevalent
with heavily used Battery Packs. Packs will generally still reach full charge under this
condition. If all fuel gauge lights were on for approximately 15 minutes, Battery Pack
will be close to fully charged. There is no defect present.
Fuel gauge lights
blink when
Battery Pack is
placed on
Charger.
Battery Pack voltage is in transition point for lighting
next fuel gauge light
Pack is cold while charging
This is normal. If the Battery Pack voltage is near the point where the next fuel
gauge light turns on, it may blink on and off for a short time until the voltage
increases.
If the Battery Pack is cold, charge current is “pulsed” at a slow rate. This can show
up as blinking fuel gauge lights. Wait for green Charger LED to indicate full charge,
or in some conditions, Charger lights will turn off (see above).
Fuel gauge lights
inaccurate while
charging.
Battery Pack is cold If the Battery Pack is cold, the Battery Pack voltage rises higher than normal during
times when charge current is applied. This can cause the fuel gauge to read higher
than the Battery Pack actually is. This effect will be more apparent at the start of
charge with a cold, discharged Battery Pack. Wait for green Charger LED to indicate
end of charge or in some conditions, charge lights will turn off (see above).
Fuel gauge
button does not
operate with
Battery Pack
connected to
Charger.
Normal Pack fuel gauge button is inoperable while Battery Pack is on Charger. Remove
Battery Pack from Charger.
Fuel gauge lights
turn on, but tool
does not run.
Bad connection between pack and tool
Internal pack connection or electronics damage
Check pack and tool terminals.
Check Battery voltage Bat+ to Bat
- with
a voltmeter. Voltage to be in range of
25 VDC- 29VDC. If voltage is in this
range, and tool still does not run,
electronics are probably damaged. If a
low voltage is measured, there may be
a broken connection inside pack..
Do not attempt to open battery pack -
Pack is sonic welded shut – CONTAINS NO USER SERVICEABLE PARTS
Lowest fuel
gauge light blinks
momentarily
when button is
pushed, but tool
runs in a steady
manner (not
pulsing).
Pack electronics damaged Replace Battery Pack.
-
+
—
V28
™
POWER LITHIUM-ION BATTERY PACK TROUBLESHOOTING GUIDE
—