yeah i did that, fed the rig from one battery. it blew up eventually. LOL lcl economy 40. it was no loss i can assure you. LOL.
they are well cheap on ebay. dont risk buying a second hand one, you run the risk of getting a mullered one that will fry your rigs innards.
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If it Aint broke, don't fix it, and if you do, don't tell anyone you touched it