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Home / SLA Battery Charger / Buyers Guide

Lead Acid Battery Charger Buyers Guide

Charging BatteryPurchasing the right charger is the key to proper maintenance for a longer battery life. This guide will aid you in locating a charger for your lead acid battery. If you need further assistance please contact our friendly customer service department.

First, identify what type of lead acid battery you have, LiFePO4, wet cell (flooded), gel cell, or AGM/VRLA maintenance free. Generally one battery charger will work for all of these; the exception is LiFePO4 and gel cell.

Amstron BatteryNext, find the voltage and capacity on your battery. The most common voltage of lead acid batteries is 6 or 12 volts. The capacity is expressed in Ah or amp hours.

Finally, determine your usage and how fast you need the battery back in service. Depending on the state of discharge, you can approximate how long your lead acid battery will need to charge.

Approximate Recharge Time Calculations
(Battery Capacity) / (Charger Current) = Hours
(Amp Hours) / (Amps) = Hours

Example: Charging a 12v / 30Ah battery with a 12v / 10Ah charger.
(30 Amp-Hours) / (10 Amps) = 3 hours.
So it will take approximately 3 hours to charge a 30Ah battery with a 10Ah battery. Please remember this is a general calculation and charge times will vary depending on the state of discharge on the battery.

As a general rule of thumb when selecting a charger for a lead acid battery, match the voltage and use one that is no more than 20% of the capacity rating of the battery (at a 20hr. rate).

Example; to charge a 12 volt / 7.5Ah battery, select a charger with a maximum charge output of 1.5 Amps (7.5 x 0.20 = 1.5).

The following chart is lead acid battery chargers that we currently have available for purchase (last updated August, 2013). The information is based on the charger manufacturer’s recommendations for the battery capacity and type. You may also refer to your user manual or battery manufacturer for charger recommendations.

SKU Voltage Charger Ah Recommended Battery Capacity Recommended Battery Type
021-0127 6 0.75 1.2-40Ah SLA, VRLA, AGM, Deep Cycle, Gel Cell, LiFePO4
021-0144 6 1.25 10-95Ah SLA, VRLA, AGM, Deep Cycle, Gel Cell, LiFePO4
021-0152 8 1.25 10-95Ah SLA, VRLA, AGM, Deep Cycle, Gel Cell, LiFePO4
021-0123 12 0.75 1.2-40Ah SLA, VRLA, AGM, Deep Cycle, Gel Cell, LiFePO4
022-0150-DL-WH 12 0.8 1.5-40Ah Waterproof: SLA, VRLA, AGM, Deep Cycle, Wet, Flooded,Conventional (best for ATVs, watercraft, motorcycles, or boats)
021-0128 12 1.25 10-95Ah SLA, VRLA, AGM, Deep Cycle, Gel Cell, LiFePO4
021-0156 12 1.25 10-95Ah Gel Cell
022-0148-DL-WH 12 1.25 10-95Ah International: SLA, VRLA, AGM, Deep Cycle, Wet, Flooded,Conventional 
022-0165-DL-WH 12 1.25 10-95Ah International: SLA, VRLA, AGM, Deep Cycle, Wet, Flooded,Conventional 
021-0133 12 2 10-155Ah SLA, VRLA, AGM, Deep Cycle, Gel Cell, LiFePO4
021-0134 12 2 10-155Ah SLA, VRLA, AGM, Deep Cycle, Gel Cell, LiFePO4
021-0147 12 2 10-155Ah SLA, VRLA, AGM, Deep Cycle, Gel Cell, LiFePO4
022-0142-DL-WH 12 5 10-215Ah International: SLA, VRLA, AGM, Deep Cycle, Wet, Flooded,Conventional 
022-0157-1 12 5 10-215Ah Waterproof: SLA, VRLA, AGM, Deep Cycle, Wet, Flooded,Conventional (best for ATVs, watercraft, motorcycles, or boats)
021-1158-12 12 20 45-215Ah Heavy Duty: SLA, VRLA, AGM, Deep Cycle, Wet, Flooded,Conventional 
022-0158-1 24 2.5 10-215Ah SLA, VRLA, AGM, Deep Cycle, Wet, Flooded,Conventional, LiFePO4
022-0169 36 15 45-215Ah Golf Cart Battery Charger - Also ok for Industrial SLA, VRLA, AGM, Deep Cycle, Wet, Flooded,Conventional 
022-0170 48 10 45-215Ah Golf Cart Battery Charger - Also ok for Industrial SLA, VRLA, AGM, Deep Cycle, Wet, Flooded,Conventional (SLI, Marine, RV)
GEN1 12 10 25-230Ah Waterproof: SLA, VRLA, AGM, Deep Cycle, Wet, Flooded,Conventional (best for boats, tractors, powersports)
G7200-1 12 or 24 7.2 14-230Ah Recovers slightly sulfated batteries. SLA, VRLA, AGM, Deep Cycle, Wet, Flooded,Conventional (best for Motorcycle, ATV, Jet Ski or Snowmobile batteries - can also charge SLI, RV or boat)
G26000 12 or 24 26 25-500Ah Deep Cycle (best for Motorcycles, ATV, UTV, Snowmobile, Jet Ski, SLI, RV, Boat, Truck)
GEN2 12 to 24 10 25-230Ah Waterproof: SLA, VRLA, AGM, Deep Cycle, Wet, Flooded,Conventional 
GEN3 12 to 36 10 25-230Ah Waterproof: SLA, VRLA, AGM, Deep Cycle, Wet, Flooded,Conventional 
GEN4 12 to 48 10 25-230Ah Waterproof: SLA, VRLA, AGM, Deep Cycle, Wet, Flooded,Conventional 
G750 6 or 12 0.75 1.2-30Ah SLA, VRLA, AGM, Deep Cycle, Wet, Flooded,Conventional (best for Motorcycle, ATV, Jet Ski or Snowmobile batteries - can also charge SLI, RV or boat)
G1100 6 or 12 1.1 2.2-40Ah SLA, VRLA, AGM, Deep Cycle, Wet, Flooded,Conventional (best for Motorcycle, ATV, Jet Ski or Snowmobile batteries - can also charge SLI, RV or boat)
G3500 6 or 12 3.5 1.2-120Ah SLA, VRLA, AGM, Deep Cycle, Wet, Flooded,Conventional (best for Motorcycle, ATV, Jet Ski or Snowmobile batteries - can also charge SLI, RV or boat)
LC-2195 6 0.3 1-3Ah SLA, VRLA, AGM, Deep Cycle, Gel Cell, LiFePO4
LC-2200 6 1 3.3-10Ah SLA, VRLA, AGM, Deep Cycle, Gel Cell, LiFePO4
LC-2211 6 4 13.3-40Ah SLA, VRLA, AGM, Deep Cycle, Gel Cell, LiFePO4
LC-2199 12 0.3 1-3Ah SLA, VRLA, AGM, Deep Cycle, Gel Cell, LiFePO4
LC1-12-1A 12 1 3.3-10Ah SLA, VRLA, AGM, Deep Cycle, Gel Cell, LiFePO4
LC1-12-3A 12 3 10-30Ah SLA, VRLA, AGM, Deep Cycle, Gel Cell, LiFePO4
PSC-12500A 12 0.5 2-5AH SLA, VRLA, AGM, Deep Cycle, Gel Cell, LiFePO4
PSC-124000A-C 12 4 20-40Ah SLA, VRLA, AGM, Deep Cycle, Gel Cell, LiFePO4
PSC-1210000A 12 10 8-20Ah SLA, VRLA, AGM, Deep Cycle, Gel Cell, LiFePO4
PSC-241000A-C 24 1 5-10Ah SLA, VRLA, AGM, Deep Cycle, Gel Cell, LiFePO4
Schumacher-SE-1-12S 12 1.5 10-230Ah Best for use on RV, deep cycle, SLI, heavy duty that may have long storage period
Schumacher-SSC-1500A 12 2,10,15 10-300Ah gel, wet flooded all sla DEEP CYCLE SLI HEAVY DUTY
Schumacher-SSC-1000A 12 2,6,10 10-230Ah gel, wet flooded all sla DEEP CYCLE SLI HEAVY DUTY
Schumacher-SP2 6 or 12 1 2.2-40Ah all lead acid
Schumacher-SEM-1562A 6 or 12 1.5 10-95Ah gel, wet flooded all sla DEEP CYCLE SLI HEAVY DUTY
Schumacher-SP3 6 or 12 3 10-120Ah all lead acid - motorcycle/SLI/RV/Boat
Schumacher-SP1 6 or 12 2 or 4 10-120Ah all lead acid
Schumacher-CR-2 6 or 24 1.5 TOY Battery powered ride-on toys
Schumacher-SP-200       Solar Battery Maintainer
Schumacher-SP-400       Solar Battery Maintainer
Schumacher-SP-1500       Solar Battery Maintainer
Schumacher-SPC-7A       Solar Charge Controller - Protects batteries and panels
UPG-D1730 12 0.5 1.25-5Ah SLA, VRLA, AGM, Deep Cycle, Gel Cell, LiFePO4
BM-24041 24 4 10-120Ah maintenance-free, marine, deep cycle, sealed, gel, and all popular brands of AGM dry-type
SHO-BMS01 6 or 12 2   Shorai LFX SERIES

 

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