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"Hawker" batteries last longer.

Got dead batteries in your M1-series tank? Before replacing those old 6TMF TMF The Motley Fool
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 batteries with more of the same, consider ordering "Hawker" absorbed glass mat (AGM AGM annual general meeting

AGM n abbr (= annual general meeting) → AG f

AGM n abbr (= annual general meeting) → JHV f 
) batteries instead.

The newly authorized Hawker AGM, NSN NSN National Stock Number
NSN Nokia Siemens Networks
NSN National Storytelling Network
NSN NATO Stock Number
NSN New Substances Notification (CEPA)
NSN National Student Number (NZ)
NSN Never Say Never
 6140-01-485-1472, is a sealed, maintenance-free battery that offers improved "deep-cycle" performance. Deep cycle is the ability of a battery to be deeply discharged and recharged a number of times without losing capacity. It costs more than the 6TMF--$267 vs. $113--but has a longer service life.

These batteries are in the process of being added to the M1A1 and M1A2 SEP 1. SEP - Someone Else's Problem.
2. (tool) SEP - A SASD tool from IDE.
 TMs as an acceptable alternate to 6TMF batteries.

There are a few things you need to know before Hawker AGM batteries can be installed in your tank:

* Hawker AGM batteries weigh approximately 88 pounds. That's roughly 16 pounds heavier than a standard 6TMF battery and exceeds the single soldier lift/carry limitations. So get help when handling the Hawker AGM batteries to prevent injury.

* Hawker AGM batteries come fully charged and should need no special battery chargers. However, some chargers have been known to overcharge these batteries, so close monitoring is vital during the first two hours.

Be on the lookout for in search of; looking for.

See also: Lookout
 heat buildup build·up also build-up  
1. The act or process of amassing or increasing: a military buildup; a buildup of tension during the strike.

. That's a sure sign that the battery is being overcharged. If the battery gets too hot, stop the charging and do not use that particular charger on Hawker AGM batteries in the future.

* Never mix Hawker AGM batteries with 6TMF batteries on the same tank. All six batteries in the battery compartment must be the same type.

Mixing Hawker AGM and 6TMF batteries on the same tank can cause charging problems and is strictly prohibited due to safety risks.

If your M1A2 SEP tank has the additional six batteries in the left rear sponson spon·son  
1. Any of several structures that project from the side of a boat or ship, especially a gun platform.

2. A short, curved, air-filled projection on the hull of a seaplane, imparting stability in the water.
 (the "6-Pack" battery mod), then all 12 batteries on the tank must be the same type.

* Field maintenance should continue to service the Hawker AGMs in accordance with the applicable M1-series tank TMs and TM 9-6140-200-14, Operator's, Unit, Direct Support and General Support Maintenance Manual for Lead-Acid Storage Batteries.

* The voltage regulator An electronic circuit used to maintain a level amount of voltage in an electrical line. It eliminates power surges, spikes and brownouts, which can cause harm to sensitive electronics. A voltage regulator "module" (VRM) is a voltage regulator in a replaceable unit. See surge suppression and UPS. , NSN 6110-01-233-1135, currently used in M1-series tanks has a charging rate that can be too high for Hawker AGMs, especially in high heat or high use situations. This voltage regulator can overcharge the batteries and could lead to "thermal runaway This article is about Thermal runaway. For other uses, see Runaway.
Thermal runaway refers to a situation where an increase in temperature changes the conditions in a way that causes a further increase in temperature leading to a destructive result.

Thermal runaway is a condition where the battery cells get so hot that they destroy themselves. Not only will this ruin the batteries, but it can also lead to a battery box fire.

Try to limit the number of times you run down the charge before starting the main engine to recharge the batteries. Running the batteries way down results in high charge currents and more heat. It also shortens the service life of the Hawker AGMs.

Deep discharging Hawker AGMs in cold environments can also shorten their life span because the current voltage regulator will undercharge them.

To solve both the high and low temperature problems, a newly designed voltage regulator, NSN 6110-01-540-7819, will be available sometime in 2007. Until then, be very careful when recharging Hawker AGM batteries.
COPYRIGHT 2007 PS Magazine
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Copyright 2007, Gale Group. All rights reserved. Gale Group is a Thomson Corporation Company.

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Title Annotation:M1-Series Tanks ...
Publication:PS, the Preventive Maintenance Monthly
Date:Jan 1, 2007
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