Enersys (Hawker) Cyclon 0810-0004 D-Cell 2 Volt/2.5 Amp Hour Sealed Lead Acid Battery

This is not for everyone but if you have a Celestron telescope like I do you will need these batteries for the clock motor. They are a but hard to find but here they are. The seem to last a very long time.

These are standard batteries in a Quantum flash power pack I have had for about15 years or more. when ever they get worn out (every 4-5 years) I just get these and replace them. This saves a huge amount of money by doing it myself rather than sending back to the company for them do it. It is just a simple unplug and plug in swap. These have plenty of power and don't have a memory or over charge problem so can leave plugged in ready to go.

Exact replacement for my rechargeable flashlight from the 80s. Part number the same as on old battery.

Had picked up an old strobe tach at an auction and it worked great when I got it didn't have a charger with it. By the time the batteries died and I finally got a charger, it was too late. I had killed the batteries. Took it apart and was surprised to see sealed lead-acid batteries. Had considered changing to a different battery type but that would have required some re-engineering of the charge circuit and that is outside my list of skills. So found these and replaced the 3 cells and all is good. Will be able to keep them charged with the cheap multi-voltage charger I picked up.

they came pretty quick, i think 3 days. They work. All batteries were 2.2v when i got them and hold their charge. Date code on the bottom of the battery is in a different font than the original batteries these replaced (from 2009) that these replaced, but no big deal, could be a different newer machine, who knows. my only gripe is the price change a day after i got mine from 14.95 to 12.00. Kind of lame.

Exact battery replacement for a rechargeable flashlight that is at least 30 years old if not more. Installation was relatively easy and the flashlight came back to life for another 30 years!

While lead-acid batteries aren't as inexpensive as I think they should be, given the technology, I couldn't find a better price, quality and delivery anywhere else. My past experiences with this brand precluded buying knock-offs to try to save a few bucks--it was worth it to have the confidence of knowing how they would perform in my application.

I own four Quantum 1 battery packs, most of them are close to 30 years old. And I replaced the gel cells several times over the years. This is normal, gel cells don't last forever, like your car battery. Quantum 1 uses three off the shelve D size gel cells made my Hawker. Their 2 volts and 2.5 amp hours. There sold individually or together in a three pack, for a total 6 volts, 2.5 amp hours. To replace the cell in the Quantum 1, unsolder the old ones and solder the new ones in place. Hawker gel cells can be recharged many times and with normal use will last for years.