I decided to do a little research on Wikipedia to find the reason.
These Moonrays batteries are Nicd, on the page it says: "The primary trade-off with NiCd batteries is their higher cost"
But the advantage it says is: "the NiCd battery has a lower self-discharge rate (for example, 10% per month for a NiCd, versus 30% per month for a traditional NiMH under identical conditions"
that means that over time, these batteries will hold their charge longer than others.
The other type of rechargeable batteries are the NiMH batteries, and their page also says: "NiMH cells historically had a somewhat higher self-discharge rate (equivalent to internal leakage) than NiCd cells. This is not a problem in the short term, but makes them unsuitable for many light-duty uses where the battery would normally be expected to last many months or years."
Either way, Moonrays DOES sell NiMh batteries, they're just a bit more expensive than these. These are all the moonrays batteries i've found on amazon.
NiMh instead of NiCd I can't give this excellent rating since i haven't had them long enough. Just purchased a week ago and put into solar lights. i did have expensive solar lights that the batteries died after a couple of years. I replaced with these new batteries and within a couple of hours they were working. The first battery I inserted in the solar light did not work at all. The second and third batteries lit the solar lights...for one day. Neither would recharge despite bright, sunny days. Haven't tried the other five yet, but I don't hold out much hope for them. Even if they work the value against the price isn't worth it. They won't fit into the containment area for the battery. They are at least 1/4 inch to 3/8 inch longer than the original battery. Beware!!!It's been 2 and half months since I bought and placed these batteries in my solar lamps. They are burning as bright and as long each night as they did the first night I put them in........so I'm pleased. All work and if they keep going the way they are, I'll be back to purchase more of them. I am de'light'ed with the Moon Ray Batteries. I will definitely purchase more when needed. I was ready to throw away our solar lights until I realized they took replaceable batteries such as these. I recommend these when you need to replace your solar batteries. replaced the batteries in solar lights that i bought from Target last year. so far so good. they hold a nice charge at this point although i've only had them a few daI orderedt these a year and half ago for my solar powered lights in my backyard and finally just reordered more to replace some of the ones that are dying out. These little babies really do last. I was suprised too. Very reliable and given they kept recharging every day for over a year and kept going rain or shine, that says a lot about the product. I've used other brands and these seem to be very reliable so far and they last a good lengtth of time as far as recharging is concerned. I have only been using the batteries for about 4 weeks but so far, so good. My solar lights stay lit longer then they did with the original batteries. I purchased an 8 pack and all of them worked. I need more batteries and will purchase the same kind. 4 of the 20 batteries I ordered were bad. I put all of them on my charger/tester to have them completely discharged, then completely recharged. 4 of the batteries tested bad, won't charge. I bought 16 of these batteries and 2 of them didn't work out of the package. And now about a month later 3 more have stopped working. What a waste of money. I even wrote to the manufacturer and have never received a reply. Tells you something about this rip-off company. Perhaps if more people didn't purchase these items the company would do something about their defective merchandise. DON'T WASTE YOUR MONEY!! Amazon should stop selling these batteries!! Turns out that a couple of my outdoor lights didn't have a battery issue but instead had a problem most likely with the solar charging cell. I replaced the others, which still worked but ran out of power early on, and the new batteries seemed to make the light brighter and last hours longer. Overall I am pleased and the price isn't bad either. I recommend these as replacements and they are 600Mah so that's sufficient enough. I also live in a climate where it snows and these lights have been in the ground for 3 years so take some advice and put them away in the early winter before the snow starts falling. Probably get years more out of them. and it came time for ME to replace the battery. to be honest, i don't live with my mom, so I don't see her solar light EVERYDAY, but i can assure you I have seen it numerous times lit up leaving dinner. After replacing, I honestly found these work better through the night over a longer period of time.
I decided to do a little research on Wikipedia to find the reason.
These Moonrays batteries are Nicd, on the page it says: "The primary trade-off with NiCd batteries is their higher cost"
But the advantage it says is: "the NiCd battery has a lower self-discharge rate (for example, 10% per month for a NiCd, versus 30% per month for a traditional NiMH under identical conditions"
that means that over time, these batteries will hold their charge longer than others.
The other type of rechargeable batteries are the NiMH batteries, and their page also says: "NiMH cells historically had a somewhat higher self-discharge rate (equivalent to internal leakage) than NiCd cells. This is not a problem in the short term, but makes them unsuitable for many light-duty uses where the battery would normally be expected to last many months or years."
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