I bought 2 2pack rechargeable ultrfire batteries and now two of the batteries wont charge???
762522
first make sure they make a good connection with the charger , i have had to scuff up the ends to make good connection , second if using a for bank you have to charge them offset from each other like 1 and 3 or 2 and 4 they wont charge side by side in a four bake charger , thrid if they still wont charge , then put one in the charger and one that is allready charged in there with it and it should, sometimes they sit along time and go down and they have to have alittle charge to get them going .
762523
I have two separate brands of these. One brand (Tangsfire) is a few mm's longer than a no brand 26650 rechargeable battery (both purchased off Amazon). The Tangsfire being longer, do charge but I have to spin them and adjust till the charger light comes on. Also, my flashlight does not work with the longer Tangsfire batteries UNLESS I unscrew the endcap some, that is, loosen the end cap. So the Tangsfire are too long, it seems. If you get a shorter 26650 I think you'll not have the problem (hassle) the longer Tangsfire cause. I just reread your question about Ultrafire brand. I don't know about them but suppose they might be long, also. I have two separate brands of these. One brand (Tangsfire) is a few mm's longer than a no brand 26650 rechargeable battery (both purchased off Amazon). The Tangsfire being longer, do charge but I have to spin them and adjust till the charger light comes on. Also, my flashlight does not work with the longer Tangsfire batteries UNLESS I unscrew the endcap some, that is, loosen the end cap. So the Tangsfire are too long, it seems. If you get a shorter 26650 I think you'll not have the problem (hassle) the longer Tangsfire cause. I just reread your question about Ultrafire brand. I don't know... » Read More I have two separate brands of these. One brand (Tangsfire) is a few mm's longer than a no brand 26650 rechargeable battery (both purchased off Amazon). The Tangsfire being longer, do charge but I have to spin them and adjust till the charger light comes on. Also, my flashlight does not work with the longer Tangsfire batteries UNLESS I unscrew the endcap some, that is, loosen the end cap. So the Tangsfire are too long, it seems. If you get a shorter 26650 I think you'll not have the problem (hassle) the longer Tangsfire cause. I just reread your question about Ultrafire brand. I don't know about them but suppose they might be long, also. « Show Less
762524
If you double stack and then try and sub ohm you will fry one or both batteries Use MNKE batteries for sub ohm just don't try anything stupid low on those Use sony batteries for anything lower than .1
238540
Best thing to do is buy a spare 2-pack batteries of same kind from amazon (less than $8) and have them kept charged as back ups
1915603
Probably depends on where you buy it from. Different vendors use different batteries. Mine are the ultrafire. They seem to work OK. Initially, i did not leave them in the charger long enough and was somewhat disappointed.When you use the charger, leave the battery in until light turns green and that will fully charge the battery.
571549
I bought 2 batteries wroth the charger as well and the batteries went bad worth in 2 months both of them if you look at the batteries and if they aren't perfectly flat they won't charge they are defective
77368
i had similar problem. my batteries were old and no longer held a charge. i ordered and received the new batteries for all 3 of my unidens, via http://amazon.com, i believe last year and they work great. replacement batteries could save you money, its up to the user to decide.
193742
Try them in multiple devices to make sure it's the batteries I have had zero issues with the batteries. Also make sure that there is no corrosion from anyou old batteries on the contacts.
2196007
This may seem a bit obvious but ensure the battery is inserted in the charger the right way round. Assuming this is not the case, determine if the charger is faulty(if you bought a second battery this will be easy)I have had no issues with mine for the last year..
1556199
Try removing the batteries then put them back in. If this doesn't work you are SOL.
1420252
I also had this happen and I believe it's because they won't keep a charge so I had mine exchanged. I charged them 3 times and right after I unplugged them I could pair them but it would only last a minute or so. That is why I figured they are not holding a charge.
1364312
I bought my batteries last year as well, one came wityh the mower and I bought an additional one. They worked fine last year and they are working fine this year. Whenever I finish using my batteries I plug them into the charger, so the are always either being charged or being used in the mower. I cannot explain why your battery does not work this year.
1455922
Check to be sure first of all that the charger is operating by looking for the red light when its plugged in. Please note: these batteries are rechargable. If the red light it is on then its possible the batteries are defective, The batteries are enclosed in the main section near the handle. Check with Radio Shack to purchase the same batteries, you may also need a soldering device due to the battery tabs are sometimes linked together.... It may be a better idea to replace the entire unit!
436263
Your charger is not for this battery. This battery is about 3 inches long and larger in diameter compared with your AA/AAA batteries. The battery is a LI-Ion 3.7 v, not like your 1.5v batteries. Get you a charger for the Ultrafire battery.......it's designed for it and low cost. My charger can charge one or two batteries at a time....no problem. Worked great with the Ultrafire 1000 lumens light.
1489786
Get a Nitecore charger. Don't bother with any other charger for these batteries. Charge both of them when you get them.
1992618
My batteries are blue just like the picture and are 1200 mah.Work great and recharge quickly with ultrfire charger model WF-139.I also have Fandyfire batteries 1200 mah and they work just as well.I am very pleased with both.They are also 14500.Good luck with yours.....
1593810
Make sure you remove the plastic strip between the batteries. They insert them to prevent the batteries from draining, but it will also prevent them from charging if you don't remove them.
1704450
Did you ever resolve this? I have just tried to recharge my batteries after long non use - one seems to have fully discharged and unit won't come on. I stated to charge second battery and it too is discharging. I have taken it off charger in case I lose it too. Love to know your outcome.
2021742
To be honest I did not discharge them first. I put them in the bays that worked. I had problems with a few of them. I now just tried the bays that did not work worked, but with a different kind of battery. There is something wrong with mine. Bummer