- Tenergy ready to Use NiMH Battery is a combination of a rechargeable and a disposable battery
- Once charges Tenergy R2U Battery keeps its charge even if you store it for 12 or 24 months. ( 85 percent of the charge after 12 months 70 percent after 24 months )
- In contrast to a disposable battery the Tenergy R2U Battery can be charged 1000 times
- 4 time more shots than with alkaline batteries
- Dimension: 18mm(H)x50mm(D)
Product Description
Key Specifications * High quality Ultra High Capacity AA Size rechargeable Nickel Metal Hydride (NiMH) battery * Exact replacement for standard AA size battery in all the devices * Provides ultra long use time per charge with this ultra high 2300 mAh capacity * Advanced NiMH technology means twice as long use life per charge than the ordinary rechargeables * combines all the features of the alkaline battery (Ready to Use) with the benefits of rechargeable battery * ... More >>
Pre-charged Tenergy NiMH AA 2300mAh Rechargeable Batteries, 4xAA
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These were cheap, and had some good reviews. I’m OK with them not having a charge when I pull them out of the pack, but after recharging they should last more than 10 minutes! To be fair, I put them in my home thermostat and they lasted almost 2 months. But, how much energy does running a thermostat use? My regular alkalines lasted for several years without replacing them! I would suggest investing in the Sanyo Eneloops instead. I’ve had much longer lasting charges with that brand. In the long run, the extra cost up front is well worth it!
Rating: 1 / 5
Terrible batteries. Especially considering that they claim these will hold a charge longer than normal NiMH. In fact, as noted by other reviewers, it’s just the opposite — the charge on these run out much faster than even regular NiMHs. I measured the voltage levels to compare to an “Ultralast” brand from Microcenter. Both started at about 1.41 V after a fresh charge. Just a day later, the Ultralast is at about 1.40 V while these Tenergy batteries are already drained to 1.36 V! Don’t make the mistake I made buying these because they were cheap — you’ll definitely get what you pay for — cheap, awful quality. (I’m kicking myself for getting scammed into buying 12 packs — argh!) SAVE your money and spend more to get a reputable brand that works!
Rating: 1 / 5
I have 72 of these LSD cells purchased 1.5 years ago when my wife was pregnant. They have been used in every conceivable baby toy, breast pump, flashlight, power adapter, GPS, flash, thermostat controllers and in some cases corporate equipment when I discovered MAHA Powerex cells were too small to fit the terminals.
Some cells arrived not ‘pre charged’. No big deal- I dropped each and every cell into my Lacrosse BC-900 charger, hit Refresh at 1A, and let them go. Since then they are in use about 80% of the time with only 10 spares sitting around- enough to replace the wife’s pump batteries so she could go another day.
In all that time they’ve never ‘run flat’ suddenly or unexpectedly. Yes, if I haven’t charged them for a long while (I do have some sitting in a bag at Room Temp that were initially charged over a year ago) they don’t hold up as well as a freshly charged battery. Am I disappointed? Nope.
Several cells have been deep-discharged- to the point that they won’t charge without a ‘jumper trick’ for the Lacrosse (google it). The cells don’t show any worse for wear- and I track all the capacities in a spreadsheet. I do mark them with a sharpie to indicate they were deep discharged, and how many times, so that if there is a problem I can spot it and discard the cell. YMMV.
In all, the average cell capacity is 2.04 Ah, Std Dev is 0.03 Ah. Max tested was 2.1 Ah and the Min was 1.94 Ah.
With Sony’s brand being 4x the cost I can tell you what I will buy, and continue to buy. I’ve been pleased by these cells and would recommend them to anyone.
Rating: 5 / 5
I’ve bought several dozen of these cells over the past several months, and I’ve had pretty good success with them, in flashlights, children’s toys, and other stuff. Charging them in my BC-900, they generally came out to somewhere between 1800 and 2300 mAh (brand new out of the pack, in “discharge” mode at default charge current).Quality control probably isn’t as good as the Sanyo “Eneloop” or Ray-o-vac “Hybrid” cells, but with the specials at Tenergy’s other site (all-battery.com), one can get them at half the price you’d get Hybrids at Target or Wal*Mart, or Eneloops at Costco.Sort/group ‘em by capacity, and don’t let them run down completely (inverse current will destroy NiMH cells pretty quickly), and you’ll be pretty happy.
Rating: 4 / 5
I baught eight of these batteries thinking the price made them a good deal. When I received these so called precharged batteries 5 had no detectable charge at all the other 3 did not have a usable charge. After charging these batteries in a good charger over night they appeared to have a full charge and work normaly for a few weeks. After a few weeks I noticed the items I used them in would sudenly stop working. When I tested the batteries either one or both batteries had no detectable charge and when I put them in my charger they did not want to charge. So far I have tossed 3 batteries and have marked 2 others that have not been holding charges for long to see if they die completely.
I have not found this battery to be of good quality and would not buy them again.
The only PRECHARGED batteries I have found to do as advertised is Unyross Hybrio batteries and Sanyo Eneloop batteries.I have been using the Hybrio and Eneloop batteries for over a year with good results. These batteries are more expensive but still a better buy than Tenergy.
Rating: 1 / 5