I have a Lifefitness 9500R exercise bike...where is the 6 volt batt. located?

Follow this link to the owners manual.
https://www.sportsmith.net/images/product_support/lifefitness/Bikes/Consumer%20Bikes%20Only/LC6500/LC6500%20Bike%20Manuals/Operation/m05100k17a083%20LC6500HR%20Bike%20Operation%20Manual.pdf

How do replace the battery in Lifecycle C9i exercise

The web site above states the following:

The 9 volt battery for the display on the bars of the bicycle goes in underneath the display (on the bottom of it).You can also see the 7th page (pages are not numbered, simply scroll to the 2nd to last page) of the manual at the link below to see where the battery installs:

https://www.lifefitness.es/static-assets/document/manuals/C9iAssemblyInstructions_12-07-05.pdf

Replacement Parts for Fitness Exercise Equipment at SPORTSMITH

If the battery continues to fail, I would check the alternator brushes and see if they need to be replaced. Chances are they are worn and the battery is not being recharged sufficiently.

Battery 6 Volt 2 5 Amp Hr LifeFitness 0017 00003 0685 SPORTSMITH net

Replacement Parts for Fitness Exercise Equipment at SPORTSMITH

It sounds like you are dealing with a stretched chain. If the chain will not tension any further, you may be looking at the need to purchase a new chain. Use your model and serial number at the following link to order a new chain.

Bike Parts for LifeFitness LifeCycle 9500 Upright Belts Pedals Seats...

If you have not already done so, start with checking the battery voltage. It should be at least 6 volts DC. Check the link attached for instructions on how to properly check the voltage on a battery. Video about How to Test Battery

Yes, Vital Fitness RB 360 exercise bike requires 6 volts DC because it is comfortable for exercise and also are safer because they are lower to the ground and result in less impact on the knees and lower back.

Replace the battery.

The Lifefitness Lifesyscle 9500HR battery location is at in the lower portion of the recumbent bike. This is a 1/2 to one hour task for most do it yourself'er.
In order to gain access to the battery compartment,you has to remove the pedals.
The center cover has to be remove.
The 6V battery will be within 12" from the pedals.

Additional reference: Lifecycle Battery 0819-0012 Model Description Terminal Volts AH L W H Lbs Price 0819-0012 Fits Lifecycle Stairmaster series 4200, 4400 - Lifecycle Lifefitness CT8500, CT9100, 9500HR, 95Ci - Star Trac 5300/6300, 5400/6400, StarTrac 6100 Pro, 6200 Elite, ET4600 (0819-0012 replaces the 0819-1006) F2 6 2.5 4.48 1.81 2.75 2 $19.80

Inside the side panels there is a 6v @ 2.5 AH batt check this with a multi meter any thing less than 6v replace it go to gymparts. com they will have this batt.

This unit takes a special 6 volt battery. The battery is in one of two places. First place to look is under the unit. If you lay the bike over on its side there is an opening in the covers. If the battery is not there then you will need to take one of the side covers off. When you get the side off you cannot miss it. The battery is black with three cylinders. You can get the battery from sportsmith.net.