0078265317 Posted October 3, 2020 Share Posted October 3, 2020 I bought this for 9 dollars and 9 cents. https://www.ebay.com/itm/Lind-Electronics-Mac-Powerbook-Battery-Charger-BC-4070/383690523212?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649 Here is an identical one. I did not want to pay so much so I took a chance on the other one. https://www.ebay.com/itm/Vintage-Apple-Macintosh-Mac-PowerBook-140-180c-Battery-Charger-Conditioner/303690343628?hash=item46b55ae4cc:g:ESMAAOSw1a5fXpoL No adapter is included. Its only 1 amp so my generic universals I have at home should work. But on the adapter in the second link it does not say polarity. Nor anywhere on the device in the first or second link it does not say what polarity. How can I tell which polarity is needed? Quote Link to comment Share on other sites More sharing options...
wierd_w Posted October 3, 2020 Share Posted October 3, 2020 according to the image, it does not have one: It's an AC-AC transformer. Not a DC transformer. Since it is alternating current, it does not matter which is tip and which is lead. You WILL however, need an AC-AC adapter that outputs 12vAC Quote Link to comment Share on other sites More sharing options...
0078265317 Posted October 3, 2020 Author Share Posted October 3, 2020 So something like this will not work? https://www.walmart.com/grocery/ip/Original-Power-Powerline-1300-mA-Universal-AC-Adapter/16778839?wmlspartner=wlpa&selectedSellerId=0&wl13=3004&gclsrc=aw.ds&&adid=2222222242131970623&wmlspartner=wmtlabs&wl0=&wl1=g&wl2=m&wl3=469442137324&wl4=pla-344436521417&wl5=9021463&wl6=&wl7=&wl8=&wl9=pla&wl10=120643079&wl11=local&wl12=16778839&wl13=3004&veh=sem_LIA&gclid=Cj0KCQjwwuD7BRDBARIsAK_5YhWoJIU6ODMLXMvUqR-hDKaU5JKaEMqkVpKldyzFJIC2rtOopRRPJ5caAuZCEALw_wcB Quote Link to comment Share on other sites More sharing options...
carlsson Posted October 3, 2020 Share Posted October 3, 2020 No, the one on Walmart converts high voltage AC from your wall jack to low voltage DC in the range 3-12V. What you need is a transformer that outputs 12V AC. While it is true that many computers and video games designed for working with AC, just as well can be powered with DC because those got a rectifier and voltage regulator right inside the system, I'm not sure this battery charger works in the same way. You would need a schematic or taking it apart to tell for sure. (Note: NEVER do the other way around, using an adapter that outputs AC to a system that expects DC. It will likely fry it within seconds) Quote Link to comment Share on other sites More sharing options...
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