Tenergy 2 Pack 9 Volt Rechargeable Batteries and TN141 Charger, 9V NiMH Battery and 9V Battery Charger for Smoke Alarms and Detectors

No problems!

Great for 9v batteries in my fire alarms... Saves money!

Good batteries.

The batteries right out of the package was 8.9volts which leads me to believe these are LSD (or Low Self Discharge) batteries. I can't confirm they are but after leaving this 9 volt battery in a multimeter tester it's still running (though i am not clear how long this particular multimeter will last for). I was going to hook these up to a LED setup here to see but i am still trying to figure out whether that will be safe for the LEDs. Once i finished charging the battery it's topped off at 9.94volts. After a few minutes it went down to 9.87 volts so it appears these batteries produce 9 volts. I assume the batteries will go down to about 7 volts before devices will start being cut off provided that is the cut off point for the multimeters.There isn't an accurate way of finding out how much mAh these batteries actually carry so i will have to determine that based on the device. However, i only have 2 multimeters that need the 9 volts and a clock. Once i figure out the time/mAh i'll post that info. The charger itself seems to be in well condition. One of the problems i had though was trying to get the battery connected to the unit. I recommend trying to get the battery hooked up before hooking up the charger to the wall. There really isn't any way to tell how much mAh a 9 volt carries since this charger does not have an LCD screen such as the smart chargers i have seen (for the AA and AAA sizes) I didn't want to pay a whole lot on a 9 volt charger just to find out it doesn't have a discharge feature. In any case this is one charger that doesn't have a discharge feature. In my research i have found difficulty finding a 9 volt charger that will discharge the battery as a feature. Though considering these 9 Volt batteries might be LSD, it's not very important to have just to have a smart charger with a negative delta v cut off feature. But with any feature like that it's not a good idea to leave the batteries sitting in the charger all day. Especially with LSD ones unless you discharged it too much.Even then, LSD NiMH batteries do suffer from low mAh due to them staying in storage for a lengthy period of time. In any case i just wrote down the time i turned on the multimeter with one of these 9 volt batteries and will simply monitor the multimeter. It will give me an indication on how long they will last, however it's not going to do much since there is no moving parts or excessive mAh usage. I will have to find a higher drain device to manually discharge these batteries. So the reason this review is missing a star (or have 4 stars for that matter). It's a huge huge plus that this charger has the negative delta v shut off but there is no LCD display nor does the charger self discharge. Another problem with this charger is being able to connect the battery to the charger terminals. It's not easy, so don't force it if it doesn't go in. You might have to keep playing with it in order to get it hooked onto the charger but it'll work, if you force it in though you might bend the connections and in my time of using 9 volt batteries, there's been a few negative connections break on me. Sometimes they get bent but usually once they do, they become brittle and break off. They don't design these things well and it's often a headache when things go wrong.Overall though, it's a charger that works better than the cheap ones. And this one is a fair price.--Update 9.7.14: The batteries that came with this, one of them the + connector had already snapped off. I was lucky enough to get it back on again but i don't think it will last very long if it broke off. Poor battery configuration and with 9 volt batteries being so poorly made this is what i was afraid of when i got this device. Hopefully i can come up with a way to fix this problem so i don't have to return the battery or get another batch. These batteries should last a long time considering their low mAh and being used in multimeters they shouldn't need much recharging. I found a higher drain device, such as this portable pest repeller. I never seen it in action (though i plan on going camping soon so i will be able to put that device to the test. While leaving this device running overnight the voltage went down to about less than a volt. These 9 volt batteries, after doing some research should only be discharged to about 2.75 volts. Oops. Well that battery shouldn't require any further discharge cycles. Unfortunately the only way to tell whether the battery is discharged is to check the battery with a multimeter. Even this bug repeller doesn't give a clear indication other than a blinking light that dims out when the voltage gets too low.These batteries are like any other NiMHs and i believe this 9 volt battery is made up of several AAAA cells so one battery in the entire pack could be over discharged and permanently damaged when it gets under a volt. If the connection breaks on that one battery again i will see whether i could solder the piece back together. That would probably be the only way of getting the connector permanently on.

Great product

I like this product very much I will definitely buy again

These batteries fit perfectly in a Simmons laser range finder and also an Ovation LX Elite acoustic guitar and function well so far. The Ovation slowly drains batteries even if unplugged so the rechargeables will save money in the long run (approximately $50 in 9v batteries in the last 10 years), and those of you who own Ovations know the battery compartment/control module is less than enjoyable to pop in and out/removing batteries/re-inserting every time you want to tune. The battery size was a concern after reading other reviewers comments.These batteries are slightly larger than the Energizer lithium but only very slightly (1/4-1/2 mm?). I anticipate no battery fit complications with this model battery.The charger seems decent enough quality if handled with care and not dropped...as with the batteries. The batteries and charger should last if not abused. I will write more in about 6-12 months...unless I get a failure before that.The batteries came with a charge but I topped off two of them right out of the package, the top off time was approximately 3 hours.

Do you play video games or have kids who have worked game controllers? Read on so you know how I've saved millions of dollars in battery expenses (approximate battery value factored for inflation in the year 2200)I bought Tynergy batteries over 5 years ago and they still work on my electronics just as good as when I bought them. I just got these because I never bought 9V rechargeables from Tynergy. It took less than an hour to recharge them which is pretty fast. If you think these are expensive then consider the savings I've had on not having to buy batteries for over 5 years and having wireless computer components used 8-10/hrs/day, fire alarms, hand held appliances, camping lights, etc. You'll probably break even in under a year. Forevermore, you Dave time from needing to go to the store and as long as you recharge them right away and have a couple backups, you'll always be ready to replace them when you need them without hesitation. I've been an avid promoter of these because Tynergy is higher quality, in my opinion, than ever other brands I've tried because they last longer. I still don't have any bad Tynergy batteries. I'm wondering how many years they'll last.

Se descargan muy rápido no sueven

una de las 2 conexiones para cargar las pilas de 9V, se dañó, solo sirve actualmente una de las 2 conexiones para recarga de las pilas,

Good as per now. Charging good within the time'period. Quality is also is good

Best charger I ever had really pleased with my purchase

Económico y cumple la función.