After losing two of 10 games, Barnsley have now lost four in a row in all competitions for the first time this season and indeed first time since a run of five between November and December 2017 (all Championship)
This defeat coupled with other results means Barnsley are now seven points adrift of safety.
They have now reached the 30 game mark and have collected only 24 points, (W5 D9 L16) their lowest total this stage since 2013-2014 when they had accrued 23 (W4 D11 L15)
Barnsley fell 2-0 behind in a game for the 11th time this season (all comps)
They were at least 2-0 down at half time for the third successive game.
The Reds have conceded in the opening ten minutes at the Valley in each of the past two seasons and the Addicks have now scored at least twice against Barnsley in five of the last seven meetings home and away.
This is the however the first time Barnsley have failed to beat Charlton in at least one league meeting within a season since 1999-2000, defeating them once in 2007-2008, 2008-2009, 2012-2013, 2013-2014 and 2018-2019.
No side has done a league double over the other though since Charlton did so in 1993-1994.
It also means Barnsley have lost successive games against Charlton for the first time since a run of six between 1981 and 1990.
Barnsley have now conceded a goal in first half injury time in three successive matches with each occasion giving the opposition a 2-0 half time lead.
Both Lyle Taylor and Cauley Woodrow scored in both league meetings between the two sides this season with Taylor becoming the third player to score home and away against Barnsley this season, after Preston's Tom Barkhuizen and Daniel Johnson.
Barnsley have won only one of their first game of a calendar month this season, and that was against Fulham in August, losing in September, drawing in October and November and now losing in December, January and February.
Woodrow has now scored in successive games for the third time this season and eighth time in his Barnsley career
Barnsley have now lost 12 of their 16 away games this season in all competitions (W2 D3)
The Reds have the joint worst away record in the Championship, alongside Luton collecting just six points, with their solitary victory also the joint lowest along with Derby.
Only Preston have scored less away goals than Barnsley's 12 (11)
Barnsley had 61% ball possession, their most in a game since the away defeat at Middlesbrough in November (63%)
1. Sami Radlinger
2. Jordan Williams
6. Mads Andersen
7. Jacob Brown
9. Cauley Woodrow
16. Luke Thomas
18. Michael Sollbauer
22. Clark Oduor
24. Aapo Halme
27. Alex Mowatt (C)
28. Elliot Simoes (for Williams 68)
14. Kilian Ludewig (for Oduor 68)
19. Patrick Schmidt (for Chaplin 86)
3. Ben Williams, 4, Kenny Dougall, 13. Jack Walton, 20. Callum Styles.
1. Dillon Phillips
2. Adam Matthews
5. Tom Lockyer
6. Jason Pearce (c)
7. Jonny Williams
9. Lyle Taylor
15. Darren Pratley
18. Andre Green
23. Naby Sarr
24. Josh Cullen
45. Alfie Doughty
8. Jake Forster-Caskey (for Williams 57)
26. Tomer Hemed (for Taylor 68)
3. Ben Purrington (for Doughty 90)
13. Ben Amos, 14. Aiden McGeady, 28. Sam Field, 29. Erhun Oztumer.
Charlton manager Lee Bowyer said:
"It should have been more comfortable really, and I'd rather it had been a bit prettier at times. Some of the players coming back are a bit rusty.
"We didn't pass it how we normally would and the pitch was dry. The most important thing at this stage of the season is three points - it doesn't matter how you get it.
"You have to dig in sometimes and grind out results, and that is what we have just done."
Sky Bet Championship results
FRIDAY 31ST JANUARY 2020
Cardiff City (12th) 1-1 Reading (15th)
Derby County (13th) 4-0 Stoke City (21st)
SATURDAY 1ST FEBRUARY 2020
Hull City (14th) 1-5 Brentford (5th)
Burke og 20
Raya og 28
Birmingham City (17th) 2-1 Nottingham Forest (4th)
Charlton Athletic (19th) 2-1 BARNSLEY (23rd)
Fulham (3rd) 3-2 Huddersfield Town (20th)
De-Cordova Reid 10
Smith Rowe 35
Leeds United (2nd) 0-1 Wigan Athletic (22nd)
Hernandez og 59
Middlesbrough (18th) 1-1 Blackburn Rovers (10th)
Preston North End (7th) 1-1 Swansea City (8th)
Queens Park Rangers (16th) 0-1 Bristol City (6th)
Sheffield Wednesday (11th) 0-0 Millwall (9th)
West Bromwich Albion (1st) 2-0 Luton Town (24th)
Daniels og 14
Barnsley lie in 23rd place in the Sky Bet Championship with 24 points from 30 games. We are 26 points outside the Play-Offs, 31 points outside the Automatic Promotion Places, 32 points outside First Place and 7 points inside the Relegation Zone.
Up to 2/2/20
Sky Bet Championship Matchday Thirty One: Barnsley v Sheffield Wednesday, Saturday 8th February 2020. Kick-Off: 1:30pm
On The Road:
Sky Bet Championship Matchday Thirty Three: Fulham v Barnsley, Saturday 15th February 2020. Kick-Off: 3pm