I have a CTM HS2800 wheelchair that has been sitting inactive for 8 years. Can the batteries be charged?

Batteries don't like just sitting around, they like to cycle that is discharge and charge. Yes you most likely need new batteries. Long slow charging is best for batteries, I would give them 8 to 12hrs.

1) Order a new charger. 24 volt 3-amp.
2) Replace the batteries if they are over a year old. Usually two each size U1 gel\AGM or SLA 12volt 34amp-hour.

The problem is going to be your motor. After extensive usage, the motor will give up internally and some times it will burn and melt the possitive/negative cables at its housing and it will give you issues with the batteries and the module.

Luis CTM: 909-590-1388

yep you will need two new U1 batteries Hope this helps you

Babble replace the batteries and check out my tip on charging your new batteries. if Medicare paid for your chair then they will cover most of the cost of new batteries contact the provider that sold you your chair and ask if they can change the battries for you Hope this helps

You have a module problem:

Evaluate your batteries. 12v Single or 24 together.
Flash codes:
1. Stall Timeout, Joystic out of neutral
2. Battery Voltage too over 32VDC hi or too low under 17VDC
3. Left motor Fault
4. Right Motor Fault
5. Left Brake Motor fault
6. Right Brak Motor fault
7. Shark Control Module Faul
8. Power Module Faul
9.Shark Module Faul

The joystick will display a sequence of flash codes. Count them and find the count here: This could be several issues, But the flash code will tell you for sure.

1. Stall Timeout, Joystic out of neutral
2. Battery Voltage too over 32VDC hi or too low under 17VDC
3. Left motor Fault
4. Right Motor Fault
5. Left Brake Motor fault
6. Right Brak Motor fault
7. Shark Control Module Faul
8. Power Module Faul
9.Shark Module Faul

Contact me Direct 909-590-1388 x115 CTM HOMECARE OFFICE

http://www.ctmhomecare.com/PDF/Owner_Manual/User%20Manual-2800%20USA.pdf

Here you go, and here's a link to their home page.
http://www.ctmhomecare.com/About_Us/index.asp?tStyle=01

the wire with the fuse belongs to external light fetures (unit does not have. It was intended for future use for external ligts)

the two yellow lights endicate problme with batteries( too low) or the module controller.

1. Stall Timeout, Joystic out of neutral
2. Battery Voltage too over 32VDC hi or too low under 17VDC
3. Left motor Fault
4. Right Motor Fault
5. Left Brake Motor fault
6. Right Brak Motor fault
7. Shark Control Module Faul
8. Power Module Faul
9.Shark Module Faul
****two yellow lights*** Module problem
Contact me Direct 909-590-1388 x115 CTM HOMECARE OFFICE

As her to explan to you how she recharges the batteries and how often she recharges the batteris, make sure she is following the owners manual. http://www.ctmhomecare.com/PDF/Owner_Manual/User%20Manual-2800%202800.pdf Explan to her the batteries can NOT Overcharge, Also trace the wiring for breaks or disconnections.