Battery Tender 021-0144 Battery Tender Plus 6V Battery Charger

• Spark proof and reverse polarity protected; unit includes a quick connect harness for use in hard to reach areas
• Perfect for all lead-acid, flooded or sealed maintenance free batteries (AGM and gel cell)
• Complete 4-step charging program (initialization, bulk charge, absorption mode and float mode) allows for optimization of battery power, without overcharging
• Automatically switches to float/maintenance voltage after fully charging the battery
• 10-year limited warranty

I use this charger to keep the battery in my 1931 Model A fully charged at all times. The eyelet harness that attaches to the battery cables permanently is great as the battery in this car is under the wood floorboards and is hard to access. Now after a ride I just open the hood and plug the Tender harness in and its good to go. Always keeps the battery in good shape.

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A Battery Tender will constantly maintain a battery without the damaging effects of a "trickle charger". Full charging initially at 1.25 amps (7.25 volts), the charger will switch to a float-charging mode of 6.8 volts to monitor a 6-volt battery. When the battery is accepting only 0.5 amps, the charger's float mode will decrease both amps and voltage. The amp rate will drop to virtually no current (0.10 milliamps), and the voltage rate will drop to 6.8 volts.

~ The "gassing point" of a 6-volt battery is 6.9 volts. Therefore, applying any voltage greater than 6.9 volts for an extended period of time will overheat the battery and warp the separator plates, permanently damaging the battery.~

(Note: This last paragraph above is the diagnosis for why 99% of all 6 or 12 volt motorcycle batteries fail after only a short life. People unknowingly use a standard 6 or 12 volt battery charger on their new battery which overheats the battery and permanently warps the separator plates. Use a Battery Tender from day one and your battery will outlive it's warranty period.)

I also recommend using "Charge It"(AGL890277Y), a cadmium additive from J.C. Whitney.

Directions for 3-cell, 6-volt M/C batteries:

"Use 1/3 of a 2.5 oz. bottle of "Charge It" into each of the three battery cells BEFORE the acid (electrolyte) is installed. Each cell receives 0.833 fluid ounces of "Charge It" and 7.167 ounces of acid.

Note: By adding "Charge It" into the battery first, you will only have to fill the battery with acid up to the upper level line, instead of having to measure exacting amounts of each." 1941-1959 Mechanics & Owners Guide to Harley-Davidson OHV Big Twins Vol. 1

Read Best Reviews of Battery Tender 021-0144 Battery Tender Plus 6V Battery Charger Here

I use this battery tender on my classic cars as well as any cars I store for the winter in another location than my home, it performs as advertised andI have used them for many years.

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The unit is small...works great... I no longer have to worry if my 52 chevy will start

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The battery charger does exactly what it is intended to do. It charges at a slow rate and keeps the battery fully charged while plugged in.