How have these batteries been stored? Have they been maintained or have they been self-discharging over the years?
2070959
Mine came in a brown box and I believ it had a static bag; either way the battery has been running good so far and coconut battery measurements were good.
864575
I use rechargeable AA batteries. The initial investment might seem pricey, but it takes years of use for them to wear out, making them a great deal in the long run. Seriously, about $12 for 2, 3, or 4 years of service? So much better than using throwaways!
1574990
I have not as yet and I basically use them every day and charge what feels like every other day. They say 10 hours and it really is at least that. I'd agree that replacing the battery is unfortunately not a likely option. The silver lining perhaps is that li-ion batteries are very good these days so with some luck they'll last several years.
563035
Oh, thanks for clearing that up for me. But I'm kinda worried that they aren't replaceable. I've seen a few batteries die completely in a state where they aren't even rechargeable anymore. I hope these lithium batteries last if you can't replace them.
1944687
I've left them in for a reasonable period of time (life of batteries) with no ill effect, though it could possible shorten the battery life. I have no evidence, just a hunch.
967126
Batteries are not permanent storage devices. Due to their chemical properties, any battery discharges over time, even if not actively powering a device. If you want your batteries to last longer, take them out and keep than cool.
1064840
A long time. They are built really good. Now the problem you will have is the battery. For long storage take the battery out of the housing. Keep it Dry and you should be able to use many times. I suggest you buy some extras batteries.
1459003
They have a manufacture date of 2012/04 stamped on them and the use before date printed on the battery is Mar 2021. It seems to me they say 10 years but mine aren't allowed to lay on the shelf that long. I like them. I use them. And I reorder them. I prefer the Duracell.
1127097
I do not have a problem with mine staying charged. I use Energizer batteries.
1180143
I have had the original model for a couple of years, and have not noticed any degradation in the batteries.
472651
I've have two of them outside for over a year now with no ill effects..... They're keeping the batteries in my generator and backhoe fully charged. They work great ... I mounted suction cups on them and just stuck them wherever I could find a good flat surface ....
1354693
not easily -- they recharge themselves in normal operation. We havent done any thing to stress-test how long the batteries last before needing recharge.
524016
They last very long, I bought this in July 2013, and I just recharged the D batteries at the beginning of December 2013. The batteries weren't even drained, I just wanted to make sure it wouldn't die before I went on vacation.
173455
As the batteries are Lithium-ion they should retain a charge almost indefinitely. That said, it best not to store Li-ion batteries fully charged (or depleted) for extended periods. Most manufactures recommend a 40-60% charge for extended storage. See: http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
1459001
Well, I purchased mine about 6 months ago and they are good until June 2021 which means they are guaranteed for 9 years. Hope that helps! Also, I would recommend buying from Amazon rather than a local store because you will get fresher batteries (higher turnover rate).
1434527
I have used these batteries for in excess of six years and have not had one issue. I think they are a good buy for the money...
2095258
No problem. The prices on the rechargable batteries keep going up. I stockpile them because I find I always use more. Never had to throw out a single one yet. They're worth the money, evey cent!