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AmpTech Sealed Lead Acid Batteries

What is AGM Technology?

Originally developed in 1980 for military use, AGM is a totally sealed (no caps, but vented for over-charge situation), maintenance-free battery with the plates packed in micro-fibre mat. AGM technology is the next step in the evolution of both starting and deep cycle batteries for all of these applications. This ‘next generation’ technology delivers increased safety, perform­ance and service life over all existing sealed batteries.

  • Sealed and Maintenance-Free
  • Fully compliant with Sealed Battery Requirements for ships, boats and yachts 
  • Excellent CCA 
  • Competitively Priced 
  • Guaranteed Longer Service Life than other Wet Cell and Gel Acid batteries 
  • Multi-Purpose Uses 
  • High Discharge Rate
  • Long Shelf Life 
  • Fast Charging (up to 150 amps)

How does it work?

As the electrolyte is captured within the micro-fibre mat, there is a much lower resistance within the battery, allowing a more efficient and faster reaction (acid migration) between the hydrogen from the negative and oxygen from the positive plates. This allows charge up to five times the rate of wet batteries.

Why AGM batteries?

Maintenance-Free / Sealed AGM Batteries
The valve regulated, spill-proof construction of the AGM battery allows trouble-free, safe operation in any orientation. There is no need to ‘top up’ the electrolyte. They will also not corrode the battery surrounds.

AGM batteries given by far the best “Bang for the Buck” due to their exceptional performance and longevity and at realistic prices.

Long Service Life
Under normal operating conditions, four or five years of dependable service life can be expected in stand-by and cycling applications. With quality charging and care not to over-charge, under-charge or over-discharge the batteries, even longer life can be expected. Perfect for both starting and deep cycle applications.

Mulit-Purpose Use
AGM batteries may be used in series and/or parallel to allow a choice of voltages and storage capacities and can be used in cyclic, starting or standby applications.

High Discharge Rate: Low internal resistance allows discharge currents of up to five times the rated capacity of the battery. High discharge rates make them ideal starting batteries.

Long Shelf Life
A fully charged AGM battery will hold it’s charge for long periods at room temperature before charging is required, due to its low self-discharge rate. This means no flat batteries after leaving them sitting for long periods.

Fast Charging
AGM batteries will allow charging at many times the maximum charge rate of standard batteries, meaning much quicker charge times.

 The AGM Difference

  • 20% faster recharge than a conventional vented battery
  • 100% maintenance free
  • High sustained discharge
  • Low self-discharge
  • Classified as Non-Spillable
  • Tested to stringent military shock and vibration standards
  • Designed not to outgas under normal charging conditions

Battery do's

  • Think Safety First
  • Do read entire Owner’s Manual
  • Do regular inspections of battery terminals
  • Do recharge batteries immediately after discharge to avoid sulphation
  • Do use quality fully automatic charging systems

Battery dont's

  • Don't add new electrolyte (acid).
  • Don't use unregulated battery chargers to charge batteries (as this will void your warranty)
  • Don't place your equipment and toys into storage without checking the batteries are regularly charged
  • Don't disconnect battery cables while the engine is running (your battery acts as a filter)
  • Don't put off recharging batteries (as this will void your warranty). Recharge as soon as possible after discharge to avoid sulphation
  • Don't discharge a battery any deeper than you have to  ( i,e, Minimise your depth of discharge to approx. 50% to increase battery life )
  • Don't let a battery get hot to the touch and boil violently when charging
  • Don't mix size and types of batteries (or old and new) if possible as this may reduce your battery life
  • Don’t over or under charge your batteries as this will void your warranty

Sizing a Battery Bank
It is always good to have twice the battery capacity that an application requires. This will promote long battery life and also reduce the amount of recharge time.

Multiple Batteries
If there is more than one battery in the battery bank, the following guidelines should be used:

  • Always use batteries of identical make, model · Do not mix different types of batteries 
  • Make sure the battery cable is not undersized for the battery system
  • Make sure the battery cables are connected to the terminals correctly. If unsure, professional assistance is recommended

Series Connection


Parallel Connection 


Parallel / Series Connection 



Battery Charging
For maximum battery life, a battery must be recharged to 100% capacity. Recharging less than 100% may result in premature battery failure. AGM batteries are not covered under warranty if they are not recharged properly. Once the battery is fully charged, remove it from charger. The following charging voltages are recommended for maximum battery life for all batteries (lesser voltages maybe used in appropriate situations)

3 Stage Charger
Bulk 14.2 – 14.8 volts
Absorption 13.7 – 14.8 volts
Float 13.2 – 13.7 volts

2 Stage Charger
Bulk 14.2 – 14.8 volts
Float 13.7 – 13.7 volts

Single Stage Charger
Bulk 14.2 – 14.8 volts

Battery Chargers
Use only fully automatic battery chargers when charging Absorbed Power AGM batteries. Failure to do so can lead to over charging and premature battery failure. Absorbed Power sell high quality, AGM specific, Switch Mode battery chargers for ideal, all application charging needs.

Providing your motor (boat, car, truck etc) has an alternator and quality voltage regulator system onboard, set to the appropriate voltage, charging AGM batteries is easy. If a dual battery arrangements is used and utilizing differing battery types, use appropriate dual battery regulator systems.

Solar Power
Solar power can also be used to easily recharge batteries where conventional AC mains power is unavailable. It should be kept in mind that a solar power regulator must be used as the voltage output of solar panels is in the range of 16-22vdc depending on the panel construction and weather conditions. We do not recommend self regulation as this method can lead to undercharging or overcharging of the battery and reduced service life. We also recommend that the regulator is fully automatic, and set to float charge at 13.7 volts and then stop charging.

A petrol/diesel powered generator may be used in conjunction with one of our fully automatic battery chargers for recharging. We do not recommend that the battery be recharged from the "Charge Outlet" of the generator (if fitted) as the charge regulation on many generators is insufficient. Recharging an AGM from the "Charge Outlet" will void your warranty should the battery be damaged. If you wish to use a petrol/diesel powered generator AC Volts outlet with a battery charger, the alternating current circuit must be capable of delivering up to 4 amperes continuously (depending on the size of the charger to be used).

Knowing When To Recharge
For maximum battery life in deep cycle applications, do not discharge the battery bank below 50%. Continually discharging the battery bank below 50% will shorten the battery life. The open circuit voltages listed below approximates the various States of Charge.

State Of Charge
100% SOC 12.80 volts or greater
75% SOC 12.55 volts
50% SOC 12.20 volts
25% SOC 11.75 volts
0% SOC 10.50 volts

For Inverter/Charger Applications
Refer to your Inverter/Charger owners’ manual to ensure that correct voltages have been set.

Battery Discharging
For best battery life do not discharge battery past 50% or at absolute worst 11 volts. AGM batteries do not hold a memory. Where an AGM battery has been stored in a flat or very low charge condition it will quickly degrade through lead sulphation. This will be evidenced by the battery showing full charge but not holding full charge, with a rapid discharge. This loss of capacity can become permanent if the battery remains in a discharged or undercharged state for even a short period of time. Sulphation is the cause of the most premature battery failures, and this can occur very quickly, so recharge your battery as soon as possible after discharge.

The following recommendations may be helpful if the battery is to be stored:

  • When storing the battery in a vehicle or vessel, it is not necessary to leave it on charge.
  • Disconnect the negative battery cable. This will prevent inadvertent discharging of the battery that may lead to a complete discharge
  • Fully charge the battery before putting it in storage and store in a cool place
  • Bulk charge the battery every 90 days to ensure maximum battery life

AmpTech Sealed Lead Acid Batteries

Model NoVoltsAmps Dimensions Weight
     C20hr L W H  Gms
AT645 6 4.5 70 47 101 0.81
AT670 6 7 151 34 94 1.15
AT6120 6 12 151 50 95 1.8
AT1212 12 1.2 97 43 52 0.6
AT1229 12 2.9 80 55 98 1.1
AT1245 12 4.5 151 53 93 1.74
AT1270 12 7 151 64.5 94.5 2.18
AT1290 12 9 151 65 94.5 2.75
AT12120D 12 12 151 99 97 4
AT12180D 12 18 181.5 77 167.5 6
AT12260D 12 26 166.5 175 125 9.8
AT12350D 12 35 130 164 180 11.2
AT12400D 12 40 197 165 170 14.5
AT12550D 12 55 228 137 210 17.7
AT12750D 12 75 260 168 208 21
AT12900DS 12 90 306 168 210 27.5
AT121000DS 12 100 330 173 212 30
AT121200D 12 120 410 177 225 37.6
AT121500D 12 150 485 170 240 42.5
AT122000D 12 200 522 240 218 62.5
GT6-225C 6 225 260 180 250 33.6
GT12-65C 12 66 355 167 183 22.7