Thrawndike bar Posted August 22, 2019 Report Share Posted August 22, 2019 (edited) Hey, I got a pair of 12v 3D printer fans, some switches, and some 9v battery connectors. After I put everything together and tested the fans, the 9v battery began to get very hot. I assumed that it had something to do with the fact that the battery and fan voltages didn't match up. Does anyone know what I should do? As far as I know, there is such thing as a 12v battery. Thanks! Edited August 22, 2019 by Thrawndike bar Quote Link to comment Share on other sites More sharing options...
gmrhodes13[Staff] Posted August 22, 2019 Report Share Posted August 22, 2019 I think you will find the 12V fans with 9V battery will not last very long at all, I down sized to some 5V and a flat battery pack of 4 x AA's, last quite a long time. If you want to stick with the 12's you could always try 2 x 4 AA packs giving you 12V Quote Link to comment Share on other sites More sharing options...
gmrhodes13[Staff] Posted August 22, 2019 Report Share Posted August 22, 2019 You may find this useful https://electronics.stackexchange.com/questions/382584/running-12v-pc-fan-with-9v-battery And https://www.quora.com/How-many-9V-batteries-are-needed-to-run-a-12V-fan Quote Link to comment Share on other sites More sharing options...
Sly11[Admin] Posted August 22, 2019 Report Share Posted August 22, 2019 Agree with Glen, 12v fans will run a 9v battery flat pretty fast. 5v and the AA batteries are the best alternative and should run for approx 6 hours non stop. I use rechargeables personally. Quote Link to comment Share on other sites More sharing options...
Digz Graavz[TK] Posted August 27, 2019 Report Share Posted August 27, 2019 I use USB fans and USB rechargeable power packs. You can literally run them for days on a charge. There are lots available on Amazon. There are also 12v batteries, but they are small and expensive. You'd go broke. The last option is to chain 8 AAs (or AAAs, or Cs, or Ds) together to get yourself 12 volts. Something like this: https://www.amazon.ca/abcGoodefg-Battery-Holder-Plastic-Storage/dp/B06ZZBX3H1/ref=sr_1_13?crid=1X9JUYBBGKV40&keywords=aa+battery+holder+with+switch&qid=1566915565&s=gateway&sprefix=AA+battery+hol%2Caps%2C180&sr=8-13 Quote Link to comment Share on other sites More sharing options...
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