Did not use for long time now the ramp won't work, dead battery
If you have a capable battery charger, then a dead battery can be recharged. I would suggest recharging the battery to the proper voltage and then letting it set for 24 hours. In 24 hours check the battery for the correct voltage. If it maintains the charge, then you should be okay to reinstall the battery. If it does not, then you may have a dead cell in the battery and it would need to be replaced. Video about How to Test Battery
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