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Cheaper trickle chargers will just keep charging and could overcharge a battery which will damage it.

Float chargers automatically shut off when the battery is fully charged.


Multi-step or Smart Chargers – These chargers are fully automatic. They go through a series of steps to diagnose a battery’s needs and then charge it accordingly, allowing the user to just plug it in, ensure there is a good connection and walk away. Combining the characteristics of both trickle and float chargers, along with the ability to make “smart” adjustments throughout the process, these chargers are able to recover deeply discharged batteries and maintain a safe level of voltage without any risk of overcharging or damaging the battery.

Amazon.com: NOCO Genius G750 6V/12V .75A UltraSafe Smart Battery Charger: Automotive $30 .75 A 4.3 (3,500)
Cutting-edge technology delivers superior performance. Charge 2x faster, repair damaged batteries.

Amazon.com: Battery Tender Plus 021-0128, 1.25 Amp Battery Charger is a Smart Charger, it will Fully Charge and Maintain a Battery at Proper Storage Voltage without the Damaging Effects Caused by Trickle Chargers: Automotive $45 1.2 A 4.7 (4,000)

BLACK+DECKER BM3B 6V and 12V Automatic Battery Charger / Maintainer: Automotive $17 1.5 A 4.1 (2875)
Automatically switches between charging mode and float mode monitoring. 3 attachment optins. Battery clips, O-ring for direct (semi-permanent) battery connection and cigarette lighter.

CTEK (56-158) MULTI US 3300 12 Volt Fully Automatic 4 Step Battery Charger $57 4.6 (652)

Amazon.com: NOCO Genius G3500 6V/12V 3.5A UltraSafe Smart Battery Charger $60 3.5A (3,500)

Amazon.com: AURELIO TECH 12V/1.2A Transportable 3-mode Battery Charger Tender Motorcycle Car Boat ATV RV: Automotive 4.1 (79)
NO Need to Disconnect AFTER CHARGED Manufacturer Part Number: BC-1212

last updated 18 Dec 2017