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Sealed Lead-Acid Batteries

Low initial cost and easy maintenance are good reasons to choose Sealed lead acid (SLA) battery packs. Sealed lead acid has the lowest energy density of the rechargeable batteries. There are many instances, however, when sealed lead acid is an excellent choice. Sealed lead acid is a good choice when size and weight aren't critical factors and cost must be kept low. This chemistry is usually found in stationary applications like uninterruptible power supplies and emergency lighting. Because sealed lead acid is predictable and easy to maintain, it's a popular choice for medical applications. Read more

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Product Name  Model  Manufacturer-  Chemistry  Voltage  Capacity  PDF   
Lead-​Acid -​ PG-​12V103FR

PG-​12V103FR
Powersonic Batteries
Lead-Acid
12
103AH
Spec Sheet
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Lead-​Acid -​ PG-​12V120FR

PG-​12V120FR
Powersonic Batteries
Lead-Acid
12
124AH
Spec Sheet
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Lead-​Acid -​ PG-​12V140FR

PG-​12V140FR
Powersonic Batteries
Lead-Acid
12
144AH
Spec Sheet
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Lead-​Acid -​ PG-​12V150FR

PG-​12V150FR
Powersonic Batteries
Lead-Acid
12
153AH
Spec Sheet
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Lead-​Acid -​ PG-​12V200FR

PG-​12V200FR
Powersonic Batteries
Lead-Acid
12
210AH
Spec Sheet
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Lead-​Acid -​ PG-​12V28FR

PG-​12V28FR
Powersonic Batteries
Lead-Acid
12
28AH
Spec Sheet
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Lead-​Acid -​ PG-​12V35FR

PG-​12V35FR
Powersonic Batteries
Lead-Acid
12
35AH
Spec Sheet
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Lead-​Acid -​ PG-​12V42FR

PG-​12V42FR
Powersonic Batteries
Lead-Acid
12
42AH
Spec Sheet
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Lead-​Acid -​ PG-​12V55FR

PG-​12V55FR
Powersonic Batteries
Lead-Acid
12
56AH
Spec Sheet
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Lead-​Acid -​ PG-​12V65FR

PG-​12V65FR
Powersonic Batteries
Lead-Acid
12
65AH
Spec Sheet
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Lead-​Acid -​ PG-​12V75FR

PG-​12V75FR
Powersonic Batteries
Lead-Acid
12
75AH
Spec Sheet
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Lead-​Acid -​ PG-​12V75TFR

PG-​12V75TFR
Powersonic Batteries
Lead-Acid
12
75AH
Spec Sheet
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Lead-​Acid -​ PG-​12V92FR

PG-​12V92FR
Powersonic Batteries
Lead-Acid
12
92AH
Spec Sheet
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Lead-​Acid -​ PG-​6V210FR

PG-​6V210FR
Powersonic Batteries
Lead-Acid
6
210AH
Spec Sheet
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Lead-​Acid -​ PS-​1208

PS-​1208
Powersonic Batteries
Lead-Acid
12
0.8AH
Spec Sheet
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Lead-​Acid -​ PS-​12100

PS-​12100
Powersonic Batteries
Lead-Acid
12
12AH
Spec Sheet
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Lead-​Acid -​ PS-​121000

PS-​121000
Powersonic Batteries
Lead-Acid
12
100AH
Spec Sheet
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Lead-​Acid -​ PS-​121100

PS-​121100
Powersonic Batteries
Lead-Acid
12
110AH
Spec Sheet
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Lead-​Acid -​ PS-​1212

PS-​1212
Powersonic Batteries
Lead-Acid
12
1.4AH
Spec Sheet
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Lead-​Acid -​ PS-​12120L

PS-​12120L
Powersonic Batteries
Lead-Acid
12
12AH
Spec Sheet
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There are many benefits to sealed lead acid. SLA isn’t affected by the so called "memory effect" that nickel batteries suffer from, and SLA has the best charge retention of any rechargeable battery. With SLA, it’s fairly easy to determine the remaining capacity based on open circuit voltage (OCV); it’s only about 20% accurate though.

There are some down sides to SLA. Bedsides the size and weight disadvantage, SLA won’t take a fast charge well, doesn’t perform well at low temperatures. SLA loses its charge quickly if stored at higher temperatures.

The exceptions are "pure lead" batteries which are capable of fast charging and perform well at lower temperatures. Pure lead batteries also have much better charge retention and recovery characteristics after long periods of storage (one or two years).

SLA batteries prefer a constant voltage charge. VRLA batteries can take a charge well from 7 hours at one-fourth the battery’s capacity in input current, C/4, to 14 hours at C/10 or one-tenth the battery’s rated capacity in input current. At these charge rates 2.45 volts per cell at 20° C is best. C/300 (capacity ¸ 300) is a good trickle or float charge current with 2.35/cell at 20°C. Also, the charge voltage must be lowered for temperature above 20°C and raised for temperature lower than 20°C. (See Third Chart Down)

Constant Current/Constant Voltage Charge Charicteristics

 


Charge Charicteristics for a Two Stage Costant Voltage Charger

 

Charge Voltage Compensation for Various Temperatures

  • Cell Voltage: 2.0V (nominal)
  • Capacity: 500mAh to 100Ah or more
  • Energy by Weight: 30 Watt Hour/Kilogram
  • Energy by Volume: Watt Hour/cubic centimeter
  • Cycle Life: 200-500 Cycles
  • Self Discharge: 5%/month
  • Temperature Range: -20° C to +60° C
  • Preferred Charge Methods: Constant Voltage C/10 to C/4
  • Applications:Communication equipment, Office equipment, Security systems, Small power tools, Toys, UPS systems, Communication equipment, Large power tools, Office equipment, Security systems UPS systems, Back-up for lighting equipment (used with solar cells), CATV, CVCF, Emergency lights, Engine starting (portable generator), PBX, Base stations, Large and small power tools and toys, Audio Communication equipment, Office equipment and VCRs

Discharge Charicteristics for a Typical 12 volt 7 Ampere Hour 
VRLA Battery


Discharge Charicteristics for a Typical 12 volt 7 Ampere Hour 
VRLA Battery

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