Thread: Battery "zapper"

I have recently built the Jaycar zapper kit K5427. Has anyone tried out one of these and if so, your comments please.
I have to wait till I get a sulphated battery to try mine out. Since i've been keeping my batteries on trickle charge I've not been having so many problems. Perhaps I should have done this in the first place instead of spending my $100 on the zapper??????
I've placed this thread on the Jaycar site but it hasn't appeared yet. Being a "company run" site they may censor any potentially negative threads.
Comments/experiences/tips most welcome.
Regards.
Bill W.

I built the Jaycar kit a few years ago - I use it for keeping the batteries on cars we don't use often working. The last example was in our Tarago, we have not driven it for about 5 months ( we have 6 cars to choose from) and never got around to disconnecting the battery and someone had not closed the rear door properly so there was absolutely no charge whatsoever - 0v on the multimeter. It would not even take a charge from the charger, but connecting the battery zapper (with the battery charger on the zapper inputs) and after a few days it was fully charged. I discharged it fully using a spotlight, then re-charged it with the battery zapper again and after that it would take a normal charge.

I refitted it and we have been using the Tarago for the past month every third or fourth day and the 2 year old battery el-cheapo autobarn $49 battery starts it as well as it ever did.

I have re-rejuvenated quite a few batteries since I bought the kit - extending the life of the batteries by about another year at least - the main killer of our batteries was lack of use or leaving the interior light or door open for a week or two.