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ESA Consulting Engineers, PAStationary Battery Information
Date Codes Unmasked 2012 EditPag
MWM 2005, 2007-12
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODES UNMASKED
Developed by
Marco W. Migl iaro, PE, Fellow IEEE
Copyright 2005, 2007-12 by Marco W. Migliaro.
All righ ts reserved.
Graphics byCA Rhodes
visit: www.stationarybatterytraining.com for updates
SM
ESASM
ESA
MWM 2005, 2007-12 2
FOREWORD
This presentation has been developed as a aid to those wishing to
determine the date of manufacture or warranty date for a cell or
battery. Manufacturers sometimes code dates using letters
and/or numbers that are not easily understood by those
responsible for the battery system. This presentation attempts to
provide those persons with a guide when needed to determine the
date code. Date codes are sometimes changed by the battery
manufacturer and there is no guaranty that the information
needed is contained in the presentation; however, it may help in
ultimately identifying a date code, either with help from the batterymanufacturer or using the information presented to interpret what
one observes. The information contained in this presentation
does not include every battery type or manufacturer.
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ESA Consulting Engineers, PAStationary Battery Information
Date Codes Unmasked 2012 EditPag
MWM 2005, 2007-12
SM
ESASM
ESA
MWM 2005, 2007-12
TERMINAL OBJECTIVE
Upon completion of this training, the participant will obtain:
An overview of the typical methods used by battery
manufacturers to identify the date of manufacture,
warranty or both for stationary batteries
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODES
Are used by battery manufacturers to establish a date ofmanufacture for their products
Some manufacturers have two date codes one representing
the warranty date and the other the manufacturing date
Letters are sometimes used to represent the month or year in adate code
Manufacturers may omit the letters I and O from the
dates codes to avoid confusion with the numbers 1 and 0
Typically, a date code system should not allow the samecharacters to repeat for at least 10 years, based on industry
standards related to date coding
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Date Codes Unmasked 2012 EditPag
MWM 2005, 2007-12
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODES (Continued)
Date codes may be located on the cell (or monobloc) cover orcell (or monobloc) post. For smaller VRLA batteries the date
code may be heat stamped or may be applied by a dot
matrix printer on the side of the cell (or monobloc) cover
If a date code cannot be found, or if found, cannot be
interpreted, one may always contact the battery manufacturer
for guidance. Battery manufacturers may change their date
coding system or may sometimes even reverse the date code,
so if in doubt check with the battery manufacturer.
Battery manufacturers will request the battery date code if awarranty claim is filed
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODES (Continued)
In the presentation, the letters M, D, W and Y, are used to
represent month, day, week and year, respectively
For example MMYYYY, would represent a date code with a
two character month and a four character year and WWYY
would represent a two character week and a two character
year
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Date Codes Unmasked 2012 EditPag
MWM 2005, 2007-12
SM
ESASM
ESA
MWM 2005, 2007-12
WHY IS KNOWING THE DATE CODE
IMPORTANT?
It is important to know how old the battery is when inspected,since some of the conditions that may be noted can be age
related and this information will be useful when evaluating the
information gathered during the visual inspection
For example, a large quantity of sediment in a 15 year old
vented lead-acid battery may not be a concern, but the
same amount of sediment in a 2 year old vented lead-acid
battery would be of concern
It is also important to know the date code to determine if awarranty claim can be made
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE 1 C&D VENTED CELLS
The date code is locatedon the cell nameplate
The code is MM/YY(June 2000 for this cell)
The letter that follows
represents the plant thecell was manufactured at
(A=Attica, IN)
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ESA Consulting Engineers, PAStationary Battery Information
Date Codes Unmasked 2012 EditPag
MWM 2005, 2007-12
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE 2 C&D VENTED CELLS
The date code is locatedon the cell nameplate
The code is MM/YY(March 2005 for this cell)
The letter that followsrepresents the plant the
cell was manufactured at
(A=Attica, IN)
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE 1 C&D LIBERTY 1000s
The date code is on thenameplate
The code is MM-YY(January 2002 for this
battery)
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Date Codes Unmasked 2012 EditPag
MWM 2005, 2007-12
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE 2 C&D LIBERTY 1000s
The date code is onthe nameplate
following the word
ship
The code is MM-YY(October 1999 for this
battery)
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE C&D LIBERTY 2000s
The date code is on thenameplate
The code is MM/YY(June 2001 for this cell)
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ESA Consulting Engineers, PAStationary Battery Information
Date Codes Unmasked 2012 EditPag
MWM 2005, 2007-12
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE C&D LIBERTY AT
The date code is on thenameplate
The code is MM/YYYY(June 2005 for this cell)
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE 1 C&D DYNASTY
There are two date codes onthese batteries
The warranty date code is onthe cover (MMYY)
The date of manufacture isheat stamped into the side of
the cover (YYMDD)
A to M, excluding I, are
used for the monthsJanuary to December
The warranty date code isnormally at least one month
after the date of manufacture
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Date Codes Unmasked 2012 EditPag
MWM 2005, 2007-12
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE 2 C&D DYNASTY
There are two date codes onthese batteries
The warranty date code is onthe cover (MMYY)
The date of manufacture islocated on the side of the
cover (YYMDD)
A to M, excluding I, are
used for the months
January to December
The warranty date code isnormally at least one month
after the date of manufacture
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE 3 C&D DYNASTY
There are two date codes onthese batteries
The warranty date code is on alabel the cover MMYY
September 2004 for this battery
The date of manufacture (notshown) is located on the side of
the cover (YYMDD)
A to M, excluding I, are used
for the months January toDecember
The warranty date code isnormally at least one month
after the date of manufacture
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Date Codes Unmasked 2012 EditPag
MWM 2005, 2007-12
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE 4 C&D DYNASTY TELECOM
The warranty date code isunder the bar code on a label
located on the cover
The date code is MMYY(October 2007 for this battery)
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE 1 ENERSYS VENTED CELLS
The date code is the last three(or four) characters of a four
(or five) character number
heat stamped into the cell (or
monobloc) cover
The first character is the plantthe cell was manufactured at
(5=Sumter, SC)
The next three (or four) are theMMYY (September 1987 for
this monobloc)
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Date Codes Unmasked 2012 EditPage
MWM 2005, 2007-12
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE 2 ENERSYS VENTED CELLS
The date code is in the firstfour characters of the cells
serial number*
The first two are the plantthe cell was manufactured
at (O5=Sumter, SC)
The next two are the YM(W=1998, C=March)
EnerSys uses A to L,including I for the months
The year starts back at Aonce Z is used (i.e., 2001)
*In some instances the date code may be a
three or four character code located above abar coded serial number for the cell, with the
last two characters being the date code
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE 3 ENERSYS VENTED CELLS
The date code is the firstsix characters of the cells
serial number*
The first two are the year,the second two are the
month and the last two are
the day of the month (July
16, 2001 for this
monobloc)
The next two are the shiftand factory where the cell
was manufactured
*In some instances the date code may be a
three or four character code located above
the bar coded serial number for the cell, withthe last two characters being the date code
YM, following the code on the previous slide
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MWM 2005, 2007-12
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE 4
ENERSYS VENTED CELLS
The date code is now on aseparate sticker and is
straightforward MM/YYYY
The first two are the month(February and November
in these examples)
The next four are the year
(2004 in these examples)
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE 5 ENERSYS - EU VENTEDCELLS
The date code is located onthe blue ring on the negativepost
The ring has a large two-digitunderlined number on itrepresenting the year and thenumbers 1 to 12 around thering represent the months ofthe year
There is a . molded in thecover opposite the negativepolarity mark and the month ofmanufacture is placed next it.In this instance the date codeis November 2011
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MWM 2005, 2007-12
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE 1 ENERSYS VRLA CELLS
The date code is in the firstfour characters of the cells
serial number located on
the steel module frame
The first two are the plantthe cell was manufactured
at (O5=Sumter, SC)
The next two are the YM(W=1998, J=October)
EnerSys uses A to L,including I for the months
The year starts back at Aonce Z is used (i.e., 2001)
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE 2 ENERSYS VRLA CELLS
The date code is now on aseparate sticker and is
straightforward MM/YYYY
The number before the /or is the month (June
and March in these
examples)
The four after the / or are the year (2006 and
2007 in these examples)
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MWM 2005, 2007-12
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE ENERSYS POWER SAFE V
VRLA BATTERY
The date code is on aseparate sticker on top of
the jar near the cell
positive terminal and is
straightforward MMYYYY
(December 2009 for this
battery)
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE ENERSYS TYPE HX VRLABATTERY TOP CONNECTED
The date code is on aseparate sticker near the
cell positive terminal and is
straightforward MMYYYY
(September 2006 for this
battery)
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MWM 2005, 2007-12
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE ENERSYS TYPE HX VRLA
BATTERY FRONT CONNECTED The date code is on a
separate sticker near the
cell positive terminal on the
top of the battery and is
straightforward MMYYYY
(November 2009 for this
battery)
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE GNB VENTED CELLS
The date code is stamped on a positive post
The code is YYMM (May 2002 and January 2005 for these cells)
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MWM 2005, 2007-12
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE 1 GNB ABSOLYTE
The date code is stamped on thesteel module and consists of athree letter code
The second and third lettersare MY (November 2000 andJune 2006 for these modules)
A to M, excluding I, are usedfor the months January toDecember; however, I is usedfor the year
The first letter is the plant the
module and cells in it weremanufactured at
The year started back at Aonce Z was used (i.e., 1997)
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE 2 GNB ABSOLYTE The date code is on a label
placed on the steel module andconsists of a three letter code
The second and third lettersare MY (March 2008 for thismodules).
A to M, excluding I, are usedfor the months January toDecember; however, I is usedfor the year
The first letter is the plant themodule and cells in it weremanufactured at
The year started back at Aonce Z was used (i.e., 1997)
The date code is a stamp
or label on the side of the
steel module
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MWM 2005, 2007-12
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE GNB SPRINTER
The date code is on a label onthe side of the plastic
container
The code is shown two ways
The first is a letter and
number representing MY
(December 2001 for this
example), where A to M,
excluding I, are used for the
months January to
December
The second is the month,followed by numbers
representing MM-Y
With a single digit for the year onemay need to verify the installation
date to determine the year (e.g., 1
could be 1991 or 2001)
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE GNB MARATHON
The date code on this front connected battery is on a label on the rearof the plastic container
The code is shown two waysThe first is a letter and number representing MY (December 2001 for
this example), where A to M, excluding I, are used for the months
January to December
The second is the month, followed by numbers representing YY
With a single digit for the year one may need to verify the installation
date to determine the year (e.g., 9 could be 1999 or 2009)
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SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE BAE
The date code is on a label located on the cell cover.The MMYY for the date code are punched on the label
For this battery the date code is December 2003
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE DOUGLAS VENTED CELLS
The date code is locatedon the cell nameplate
The code is MMYY (April2004 and July 2005 for
the cells shown)
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MWM 2005, 2007-12
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE EAST PENN UNIGY I
The date code is on thenameplate on the battery
container
The code is YYMM(February 2003 for this cell)
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE EAST PENN UNIGY II
The date code is on thenameplate on the steel
module
The code is YYMM (June2003 for this module)
There is also a date codeon the side of the steel
module
The code is WW YY (week22 of 2003 for this module)
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MWM 2005, 2007-12
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE EAST PENN TELECOM
The date code is on thenameplate on the battery
container
The code is MMYY(September 2004 for this
cell)
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE EAST PENN FRONTCONNECTED
The date code is on a labelbeneath the nameplate on
the battery container
The code is MMYYYY (May2009 for this battery)
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MWM 2005, 2007-12
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE FIAMM/ALCAD/SAFT
VENTED CELLS
The date code is stamped on thecell cover and consists of a letterfollowed by three numbers
The first letter represents theyear (H is 2001)
The letters used are based on theItalian alphabet, A to Z, so theletters J,K, W, X and Y are notused
The three numbers represent theday of the year (i.e., 1 to 365, or
1 to 366 for leap years) that thecell was manufactured on
The last letter is the cell type
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE 1 FIAMM/ALCAD/SAFTMONOLITE VRLA BATTERY
The date code is stamped on the cover of the batterycontainer
The date code is YYMMDD (March 4, 2002 for this battery)
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MWM 2005, 2007-12
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE 2 FIAMM/ALCAD/SAFT
MONOLITE VRLA BATTERY
The date code is stamped on the cover of the batterycontainer
The date code is WW YY (week 19 of 1992 for this battery)
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE HAWKER*
The date code is on a labelabove the nameplate on the
battery container
The code is MM/YY(August 2002 for this
battery)
*Hawker was acquired by
EnerSys
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MWM 2005, 2007-12
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE HOPPECKE
The date code is on a labelon the cell cover, separate
from the cell nameplate
The code is MM/YY (May2010 for this cell)
SM
ESASM
ESA
MWM 2005, 2007-12
INTERSTATE BATTERIES CONCERTO(FRONT CONNECTED)
The date code is on a labelor sticker on the jar cover
MMYY (February 2007
below) or MMDDYY
(August 1, 2007 left side)
for the batteries shown
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SM
ESASM
ESA
MWM 2005, 2007-12
INTERSTATE BATTERIES CONCERTO
The date code is on a label onthe jar cover MMYY (February
2007 for the battery shown)
SM
ESASM
ESA
MWM 2005, 2007-12
INTERSTATE BATTERIES HIGH RATE The date code is on a label on the jar cover MMYY (October 2003 for
the battery shown) and there are punch-outs on the nameplate that
can be used to indicate the installation date
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MWM 2005, 2007-12
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ESASM
ESA
MWM 2005, 2007-12
DATE CODE HBL VRLA CELLS
The date code is on asticker affixed to the
side of the steel
module and is
DD.MM.YY (October
2, 2006 for this
battery)
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE NIFE/LORICA
The date code is punched on the specific YY MMprinted on the cell cover
For this cell the date code is October 2003
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ESASM
ESA
MWM 2005, 2007-12
DATE CODE 1 NORTHSTAR
The date code is on a label onthe side of the plastic
container
The code is straightforwardand is MMYYYY (August 2005
for this battery)
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE 2 NORTHSTAR
The date code is on a label onthe side of the plastic
container
The code is straightforwardand is DDMYY (11 August
2005 for this battery)
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ESASM
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MWM 2005, 2007-12
The date code is on a labellocated on the cell cover.
The DDMMYYYY for the
date code are indicated
(i.e., blacked out) on the
label
For this cell the date codeis December 15, 2003
DATE CODE 1 TAB BATTERY
(MTI TECHNOLOGIES)
SM
ESASM
ESA
MWM 2005, 2007-12
The date code is heatstamped as YYMDD or
YYMMDD on the cell
cover.
For this cell the date codeis June 18, 2001
DATE CODE 2 TAB BATTERY(MTI TECHNOLOGIES)
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ESASM
ESA
MWM 2005, 2007-12
DATE CODE TYCO
The date code is on thenameplate on the steel
module
The code is YYMM (June2002 for this module)
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE YUASA NP
The date code is the firstfive characters heat
stamped on the cover on
the side of the container
The code is YMMDD(October 2001 for this
cell) for monoblocs
manufactured in North
America The code is different if
the monobloc was
manufactured in Asia
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ESASM
ESA
MWM 2005, 2007-12
DATE CODE CHINA STORAGE BATTERY
The date code is thefirst six characters on
a label on the side of
the container
The code is YYMMDD(March 27 and April 7,
2001 for the labels
shown)
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE PANASONIC VRLA
The date code is printed ontop of the container and is
YYMMDD (February 13,
1993 for this battery)
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ESASM
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MWM 2005, 2007-12
DATE CODE 1 POWER BATTERY
The date code is stamped onthe negative post
The code is MM/Y(November 1997 for this cell)
With a single digit for theyear one may need to verify
the installation date to
determine the year (e.g., 7
could be 1997 or 2007)
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE 2 POWER BATTERY
The date code is stamped onthe negative post
The code is MM/Y (October2007 for this cell)
With a single digit for theyear one may need to verify
the installation date todetermine the year (e.g., 7
could be 1997 or 2007)
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ESASM
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MWM 2005, 2007-12
DATE CODE POWERWARE VRLA
The date code is thefirst six characters on
a label on the top of
the container
The code is YYMMDD(February 14, 2006
for the labels shown)
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE WERKER
The date code is on a label onthe end of the plastic container
The date code consists of aletter and number representing
MY (April 1999 and March
2000 for this example)
With a single digit for theyear one may need to
verify the installation date
to determine the year
(e.g., 0 could be 1990 or2000)
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ESASM
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MWM 2005, 2007-12
DATE CODE CHLORIDE VENTED CELLS
The date code is located onthe red polarity ring at the
base of the positive post
The red ring has a two-digitnumber on it representing
the year, followed by the
numbers 1 to 12 for the
months of the year
There is a - molded in thecover and the month of
manufacture is located at
the -. In this instance the
date code is June 1984
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE 1 ALCAD NiCd
The date code is onthe cell container
The code is MM/YY(July 2003 for this cell)
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ESASM
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MWM 2005, 2007-12
DATE CODE 2 ALCAD NiCd
The date code is onthe cell container
The code is YYMM(May 2005 for this cell)
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE 1 SAFT NiCd
The date code is on thecell container
The code is MM/YY(March 2002 for this cell)
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ESASM
ESA
MWM 2005, 2007-12
DATE CODE 2 SAFT NiCd
The date code is on alabel located on the side
of the cell container
The code is YYMM(December 1994 and
November 2008 for
these cells)
SM
ESASM
ESA
MWM 2005, 2007-12
DATE CODE 1 NIFE NiCd
The date code is on the cell container
The code is YQ, where a random letter was used for theyear and the letters N, I, F, E were used to represent the
1st
, 2nd
, 3rd
and 4th
quarters, respectively. The letter Ywas used for 1998, so this cell was manufactured during
the 3rd quarter of 1988. Since the letter representing the
year is random, the manufacturer would have to be
consulted in any case