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The best battery charger ?

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I've been using one of these for many years, no issue at all!



'76 2002 in Malaga (110k Original, 2nd Owner, sat for 20 years and now a toy)
'86 Chevy K20 (6.2 Turbo Diesel build) & '46 Chevy 2 Ton Dump Truck
'74 Suzuki TS185, '68 BSA A65 Lightning (garage find), '74 BMW R90S US Spec #2

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The one you can find when you need it...


The one you remember to use...


A 30a 13.5v power supply I bought by accident, then stuck some meters on...


Probably not one from Harbor Freight, but, then, see #1


I have a Deltran BatteryTender one that works on AGM's, and I like that.  It's tiny, though.


no help here,




"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

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6 amps is like trying to fill your swimming pool with a garden hose.  If you are trying to CHARGE a battery you need at least 20-30 amps.  The maintenance chargers only put out between 0.5-3.5 amps and are just designed to "keep up" with the natural discharge a battery does when sitting along with the parasitic drain more modern cars have (Clock, ECU memory, Radio memory, keyless entry system receiver,etc) I have had a very large NAPA 2/40/60/200 amp charger for over 20 years and it gets the job done.  The stuff in the back of the garage during the winter gets maintenance chargers. 

1970 1602 (purchased 12/1974)

1974 2002 Turbo

1988 M5

1986 Euro 325iC

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I use a couple, based on requirements.


I've got one of those 3.5 amp smart chargers.  Great for top ups/extending the life of batteries.  I'd like to think it's part of the reason my TDI sitll has the original battery (9 years of Western Canadian winters).  Only downside, it requires the battery to have some charge in it.  Also does 6 volt and has Cold/AGM settings.


Some random 2/10/50 amp Canadian Tire model.  Had it for years, banged up, cords replaced.  Great for boosts (could be bigger), or recharge from completely flat.


Then I have the battery charger (~5 amp 6/12volt) that was given to me by my Dad.  He tells me it's the first 'tool' he bought.  Worked great when I was working on a 6 volt Honda C70.


Oh yeah, a bunch of 1 or 2 amp ones I permanently mount in cars to trickle charge/warm the battery when I plug in during winter.  IMHO, safer than a battery blanket.

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I ended up buying a Sears Die Hard


Its a new version of the old time chargers on wheels dolly.

275 amps for jump starts

digital and timer, and it actually has a battery tester/alternator tester

$250 memorial day sale

Edited by Road trip
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I describe in the new electrical book, any three-stage computer-controlled charger should do the job, but I used Interacter brand chargers at work for years (geophysics runs on batteries), and have continued to use them in my automotive world. American made, very high quality.

The new book The Best Of The Hack Mechanic available at https://www.amazon.com/gp/product/0998950742, inscribed copies of all books available at www.robsiegel.com

1972 tii (Louie), 1973 2002 (Hampton), 1975 ti tribute (Bertha), 1972 Bavaria, 1973 3.0CSi, 1979 Euro 635CSi, 1999 Z3, 1999 M Coupe, 2003 530i sport, 1974 Lotus Europa Twin Cam Special (I know, I know...)

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I prefer the old not-smart style, because I use it to power my electrolysis bucket, (to remove rust).  The intelligent chargers think the bucket is a charged battery and shut off.


So, I'd suggest buying a cheap/dumb charger and spend the money you save on a better/smart timing light.

(I also recommend setting up an electrolysis tank, because everybody needs one of those).






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