How do I know when these have reached the limit and to be recharged?
1388629
You can either guess, or buy some of the little indicator cards that have little patches which turn from blue to pink .
1388630
I typically use these in storage of food items so once I open the item back up I assume it is going to start absorbing ambient moisture, but haven't noticed them doing so quicker than I have used the product. You may want to check you re-opened items monthly for any sign of moisture, ie clumping to know when to toss one out and replace or add a new one. They put these things inside purses and stuff in wharehouses for years and they seem to still work, maybe check the manufacturers website, they may have statistics.
2269945
Best to use Duracell (4) AA batteries. They should last 20-24 hours if new. Keep recirculating them as they loose power within the unit for max. use. I always keep an extra set in my carrying case for back-up and change after the ones in my unit are about 1/2 life left. You can use rechargeable but they won't last as long and you need to charge them up before you go out for max. efficiency. Happy Hunting!!!
1974273
Short answer - yes. However, if you try to use them after they have reached their "protected" level of discharge, you can get them to discharge so low they will not recharge.
904121
Can't say I have closely watched the time to recharge. Generally plug in battery and leave it while I do other things. When charging, once you get the solid green light, you should be done. When battery affixed to the light, you should see three green lights. As charge depletes, lights progressively diminish. Once down to a single light, your battery might stop quite abruptly from my experience.
697429
Oddly, these batteries remain on the list (as of Aug 1 2015) even after I've put a check in the "rechargeable" filter (to stop seeing non-rechargeables). They show up as "rechargeable" even though (based on the answers here) they almost certainly aren't rechargeable.
230269
L-ion batteries have a limited amount of charges they can take, usually about 400 to 500 times before they stop taking enough charge to be useful anymore. Some people will hit that amount in a year if they use them heavily. Also batteries that have been sitting around too long while discharged may not take a charge easily.
2134215
Since they are rechargeable, I have no idea how many times you can charge them. However, we've never had them discharge fully but only use them a maximum of 3-4 hours at a time with no problems.
785989
i can't tell you, but Ive had no trouble with them. I've recharged these several times. They work well.
1909151
They are fully charged in just a couple hours if they are completely dead. Unfortunately there is no indicator light letting you know when they are fully charged.
482209
To maximize the charging system use it until the charge is completely done. Let it cool down and then recharge.
266997
Sometimes "New" batteries have sat on shelves for so long they have discharged completely. I advise getting Rechargeable batteries with a charger, remove and install when fully charged light indicates full charge. Otherwise, return the timer for a new one, could be a lemon, it happens. My cheap-o batteries from the dollar store barely lasted a month, but the rechargeables are still running after 3 months.
1472436
Thanks Phil. I was concerned that these batteries that are factory pre charged have not been on the shelf for months. There is a limit to shelf life on these batteries.
527941
Ken,I did not think these were rechargeable. I have never tried to recharge them.Dan
1805086
I usually charge them overnight so I don't have an exact time to "full charge".You may have one or more wornout batteries.
640723
Sorry, I don't know. They came fully charged, so you might assume you and recharge them and store.
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.
1524535
Yajvendra, I can't give a good answer. I place batteries of different states of discharge in the charger and go about my business. When I get home a 4-5 hours later, they're charged. I don't know at what point they've each reached their charged state.