On 31 minutes, the Rebels opened the scoring after a silky one-two between Johnny Goddard and Obi, with the striker sitting Rangers defender Ricky Modeste to the ground, before slamming the ball into the roof of the net.
A few minutes before the interval, Obi doubled his tally and the Rebels’ lead.
Goddard prodded a ball through to Obi who shrugged off two defenders, then calmly poked the ball into the bottom left corner in front of the superb Slough supporters.
In what was a scrappy opening exchange, Slough got a foothold in the game and saw a Shane Bush header cleared off the line after meeting a Matt Lench corner.
Mitch Beeney was called into action for the hosts, as he smothered away an Elliot Benyon effort at his near post after a mistake at the back.
Obi was purring, and before the break was close to being on the end of a through ball, with Beeney clearing.
Tyrese Owen tried his luck from range as he struck an effort just over the bar before the referee blew for half time, a good half for the Rebels.
Josh Jackman warmed the palms of Beeney with a rasping strike in what was a less than eventful beginning to the second half.
The lively Goddard went close to adding a third, curling an effort from the edge of the box just widen of the post.
On 64, Rebels stopper Will Dennis made a superb save to deny Mo Bettamer whose half volley was tipped away at full stretch, in what was a rare opening for the Beach Boys.
Slough were happy with the two goal cushion and defended resolutely with Dennis also coming to claim multiple crosses after an aerial bombardment from the hosts in the latter stages.
The Rebels saw out the game with minimal concern, with a morale-boosting victory – and will look to get back-to-back victories when they face Hungerford at Arbour Park this Saturday.
Concord Rangers Line up
Beeney, Popo, Thomas, Pollock, Monville, Blanchfield, Williamson, Bettamer, Kyei, Burton, Modeste. Substitutes: Day, Manor, Ogunwamide, Hernandez, Benstead.