I just baught a used rechargeable lantern, and

Pretty much impossible unless you fish it through with a snake wire. You don't say why you are trying to do this? Just use a standalone rechargeable LED light or lantern.

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You just turn them 90 degrees and the pins will be visible. Just pull the tube out towards you. The slots are visible in this image.

https://www.lighting-gallery.net/gallery/displayimage.php?album=1420&pos=28&pid=47436

https://www.google.com/search?q=JML+2866+lantern+change+tubes

2:28 shows how to remove a larger version with the 2 narrow pins.

Question edited for clarity, FULL 'make model (what it is)'.

These are cheap junk made in China. There is no support and no spares. Buy a new one on Amazon, there are two left and use yours for spares. if you need them. Read these reviews!

https://www.trailspace.com/gear/ozark-trail/led-rechargeable-lantern/

https://www.google.com/search?q=Ozark+Trail+CL-108-2

It you want quality and support, buy Fenix, O-Light or Petzl

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If you are talking about the Coleman 4345 lantern it is rechargeable using one of the chargers (mains or car) stored in the base. Are you saying it won't recharge?

William, went to Coleman site, looks like you remove screws on bottom of lantern to access and change battery.
Check the attached links to your manual,
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

http://r1.coleman.com/Manuals/5327.pdf

Rugged Rechargeable Family Size Lantern

Coleman Rugged Rechargeable Lantern Replacement Parts Flashlights...

Battery Buyer Batterybuyer com

GO TO GOOGLE TYPE IN INSTRUCTION MANUEL FOR RECHARGABLE LINCROSS CH8858 FLASHLIGHT.YOU SHOULD BE ABLE TO DOWN LOAD OR READ IN PDF.

Charge time is 18hrs. If you left it on and it was flat, imediately charge for 40hrs.
heres the manual.
http://r1.coleman.com/Manuals/5312R.pdf

There are several different models of the Swiss Gear rechargeable lantern. On most though, you can remove the top portion of the lantern and check the lighting element inside. In most cases the elements can be removed and replaced. I have a dual filament lantern and from experience I know that every so often you may have to go buy a replacement light piece. If the lantern has been bumped or even just strapped to the outside of the pack while walking, it's possible for those elements to become loose and need repositioning or replacement so do check that. I'm sure that it should be unlikely your charger is malfunctioning unless you left it plugged in for some very extended period of time, in which case I would say the light would be more likely to burn out. But definitely try that and if that doesn't work the battery pack on the lantern itself may have an issue in which case you can always get a replacement.

There are several options to buy replacement batteries for a Coleman rechargeable lantern, model 5348-700. I just picked up two new batteries from www.1000bulbs.com for $4.87 each plus shipping. ($20.99 for 2 with shipping!) Do a Google search for: ub645f1 6 volt - 4.5 ah - f1 terminal battery for other options

just read the charging instructions. Charge for 16-18 hours. If stored for more than 6 months recharge for the full 16 hours. Do not leave the lantern on after the battery has stopped, has overdischarging the battery can cause problems in recharging to a full charge. If this does happen, switch lantern to off and recharge for 40 hours.YES 40 hours. Only the LED is the only light to be used while charging. If you hane the other light on hi or low the battery does not charge.

Hope this helps