1967-1969 Delco Energizer R-59 Maintenance-Free Battery

[68 DANA]

It sounds like the Maintenance Free "AGM" (absorbent glass mat) technology has proven itself. Just need to be careful in the maintenance of the battery.

[Kurt S]

I did alternators and batteries for an OEM for many years.
Top two killers of batteries are high temps (why some batteries have insulation around them) and deep cycling.
If a high frequency pulse is applied, it will remove sulfate build up which is covering the plates. PulseTech manufactures this technology (there may be others). I've used it to recover batteries that couldn't even crank a car - and then used the batteries for several years.
A quick look at their current product line found: http://www.pulsetech.net/XC100P-Xtre...ator-7346.aspx

Many trickle chargers overcharge the battery, fwiw.

[CC Rider]

I have not had good luck with AGM batteries here in AZ. Gone through two in seven years here. When I sold my Chevelle, it had a brand new O'Reilly's battery with a battery topper on it.

Even bought two specialized chargers / maintainers.

[flyingn]

The second one in my Judge. The first one lasted about 10 years. They work good.

[jl8z28]

The batteries that they are selling now do not have acid in them like the ones they were selling in the past They say to let them charge down and use a battery charger to recharge

[SeattleCarGuy]

I have repop batteries from Restoration Battery in all my cars. The one in my 1962 Bel Air has been in there for 12 years and still works fine. Unbelievable.