They are a float charger. Just a regulated power supply good for about an amp. The voltage is about 12.5 volts. I have one of the garden tractor. C an check the exact voltage if you want it. But Harbor Freight almost alway s have them on sale for about 6 bucks.
... The Battery Tender comes with an alternate connector (you can see it in the linked advert) that you hard wire to the battery and leave the connector h anging outside the car (near the headlamp for example) to connect to the tr ansformer. I've never tried it but it would probably self-disconnect if yo u drove away.
I did have a failure on mine after a couple of years but it was easy to fix - the smoothing electrolytic had gone low in value, I just replaced it and it worked again.
The design isn't bad - it uses a small AVR microprocessor to measure the vo ltage and control a PNP pass transistor from the bridge rectifier. No curre nt limit but I presume it uses the transformer impedance to do that.
It seems to have a reasonable control algorithm - it will initially charge the battery to about 14.4v terminal voltage then float it at ~13.8v. I don 't know if it is temperature compensated but it is protected against batter y reversal, short circuit etc and the LED indicates the operation state.
"Jim Thompson" wrote in message news: snipped-for-privacy@4ax.com...
I have read that tires should be ran so often so they get hot and they will last longer as far as the dry rot types of problems.
For about 10 years I had an old beater of a truck that I seldom drove. About every 2 weeks I would drive it to work which was about 15 miles each way. Seemed to solve a lot of problems.
Did my taxes and my total mileage on the SUV was 1260 for all of 2015. Well over half of that for business. Plus over 4000mi split about 50/50 between mountain bike and road bike. Some of that also for biz and the IRS allows no standard mileage there. Hurumph!
I'll second that. All my friends who are into show cars and restored oldtimers use those.
Now, now, you are an old hand at the art of analog and can't design a contactless magnetic link? Just about every rechargeable electric toothbrush has that.
The redneck way would probably be a phono jack and a rope :-)
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.