Nedavno Ban napisa:
Local parts store only has ZY 27 (27V 1,3W), and ZX 27V (27V 10W) which is to expensive to buy for making something that may not work, just as a pastime.
I wouldn't let it connected for a year. Perhaps a month or two, and then recharge it. I used to do that, but as soon as the battery is out of the car, unused, it dies quickly. I tried to connect my charger to a timer that switched it on for a 20 min three times a week. Unfortunately timer died while I was away for a three weeks, car battery got charged all that time, and it died.
What sort of voltage / current do I need? Do you have any links to a good proven trickle charger design?
I've found different ones from small ones (like the ones for mobile phone), to 1A. But isn't 1A (when battery is fully charged) cause electrolyte to boil?