EnerSys Cyclon Genuine 0819-0012 6 V 2.5 Ah D Monobloc Sealed-Lead Acid Battery

I’ve had this battery for months and it’s still working very well on my exercise bike! It hasn’t been an easy battery for me to find but now I’ll know where to find it!!

Needed a replacement battery for my LifeCycle C9i. The display would not light up. This can happen with an old battery (like mine) or if you don't use the bike for a number of months (like mine). Replacement requires T20 and T30 Torx screwdrivers to remove the right side of the shell and one pedal. You will also need to remove the front two screws from the left side shell to allow access to the battery. You may also need a T30 socket if the pedal screws are hard to remove. You will need regular screwdriver to remove the battery screws and a pair of needle nose pliers to remove the battery connectors. Be sure to attach the red lead to the + terminal and the black lead to the - terminal.The replacement is straight forward, if you are handy and have the tools. If not, call a service tech.My original battery was a 0819-1006, but this is identical in configuration and works just fine. Same voltge and Ah rating.

Works as advertised.

The information supplied about "How easy it is to replace this battery" is completely FALSE. I am taking a break after my two-hour first attempt. Taking the battery out is a small challenge itself because the wires attaching the battery to my R9 Lifecycle bike are short, very short. There is very little wiggle room. It can be done, but be careful you do not pull-separate the spade-attachment from the wire; replacing that piece is not for the faint-hearted. I was successful with taking it all apart. Just being careful is the key. HOWEVER, putting the screws back-in-place is hard, very very hard. You have to hold the battery just-so, aligning the screw hole in the battery with the screw hole in the bike. Then you have to take a screw driver with attached screw and put it in the battery hole, with absolute perfect alignment with the two, now-invisible holes, then screw it in. You need a lot of skill for this part and a whole lot of luck to get the screw, and the two holes perfectly aligned while turning the screw driver. I did not have good luck and am taking my time-out before I try again. Perhaps more later.UPDATED Reply: As pointed out, my review was related to the Lifecycle, not the battery. My apologies; I got caught up in the moments (many) of installing the battery, not on the quality of the battery itself.The battery is working finee, just as one might expect from such a battery. I will note however that all of the people giving glowing reviews of the battery's use in the Lifecycle seem to forget/overlook this problem. So. for the record: battery is fine; installing for use in the Lifecycle, not so much (3.5 hour install time).

When the panel on my LifeCycle recumbent bike (HR9500) stopped working and I could no longer control the resistance on the bike, I was worried that I would have to decide between a replacement bike or a very expensive repair. A few simple searches lead me to discover that there was simple battery failure. Many helpful people helped confirm through Amazon Questions that this battery model would work on my unit. The battery was located under the bike, beneath the console control and took just a few screws to replace.Perfect fit. Instantly fixed my machine. I included a few photos of the comparison of the old battery and the one received, and the location of the battery in my particular model. Couldn't be happier with this easy repair and that this was available here on Amazon.

This replacement battery worked great on my old lifecycle. I was able to install it myself, and save some money. Getting access from the cover was the hardest step. After that installation was easy. Make sure you watch the battery polarity! Highly recommend.

Perfect fit and easy replacement for life fitness CLSX elliptical.

Battery is now at 2.964 volts and not holding a charge. Purchased in March 2025.