Battery does not perform as expected
349283
After fully charging battery as directed, it simply 'shuts down' after only a few minutes use.
1812952
I bought the battery to use as a spare when I'm traveling and used it a few days so far.  Last time I fully charged, the battery was down to 67% after only two hours (no usage at all).  I tried to charge it and wouldn't charge above 75%.  I replace the battery with the one that came with the phone (about 1 year old).  The original battery lasted as expected, about 95% after 2 hours.  If this is really an original Samsung battery, it must be very old or defective.  Will try to return it.
4893519
Based on other reviews of the performance of this battery, I purchased it.  I have been very dissatisfied with this battery's performance. It has lasted less than half of the claimed time of 6 hours.  I've had it less than 2 months and my indicator is already reflecting that this battery needs to be replaced soon.  I called the TechFuel company for a replacement.  I received the new battery and it actually disabled my computer. I can only operate my computer by uninstalling the battery and plugging the computer into an electrical outlet.  I am now forced to return both batteries to TechFuel and purchase an original Toshiba battery at a cost of over $126.
3579335
I bought this battery based on the reviews and wanted a backup to my NPFH70 battery that is about 5 years old.  However, I'm wondering if this is a true Sony battery (I read another review).  It does comes in a "Sony" packaging and the size is the same.  This new battery does not have the same markings as my older Sony battery.  After charging the new battery, I looked at the battery info in my camcorder.  It showed 80% charged.  I plugged it back in, but it never got any higher.  I decided to check to see how long it would record using no other camcorder features.  The battery recorded for 1 hour and 6 minutes.  The battery was completely drained.  I charged the battery again and it still would only go to an 80% charge.  Just to compare, I tested my old battery.  I was able to charged it to 100% according to the camcorder info.  The old battery was able to record for 1 hour and 40 minutes.  This new battery will not charge fully and will not hold a proper charge.  Being higher price than the other non Sony batteries and not doing the job, I'm returning it.
266656
The battery seems the same as that which came in the phone, but it barely holds a charge.  I purchased TWO of these as my wife has the same phone.  Same results for 2nd of these: poor battery.  It will do in a pinch for a backup, but frankly, I'm better off keeping the main/ first battery charged and recharged.
839844
I returned the battery. It was below advertised charge capacity. The battery was unable to deliver sufficient current for my laptop to run cpu-intensive applications, causing the laptop to spontaneously shutdown.
4581807
The battery will not charge to 100%. Since the first 100% full charged, the battery won't charge more than 89%. Very disappointed. If this continues for next few days, need to return it.
4664424
Battery doesn't seem to last very long.  must be charged often
4053130
I do not remember what I paid for the battery. It arrived later than expected, and it does not work.
1690019
I purchased this item for an outdoor boot camp after another trainer had great success with it. I can't say my story is the same. I charged the battery for two days initially until all the lights were green only for the battery to die 30-minutes into class. It says the battery life is for 12 hours, but I can barely get 1-hour. This instance has happened every time I use it, so it is consistent. Needless to say, I am asking for a refund.
2704005
Battery was ok but does not hold a charge like a new battery
3858876
This is ok, but I do not get more than 3 hours of use out of the battery before I have to plug it in. I expected way more battery life than what I got.
2668186
The battery is not as portable as mentioned in the description and pics. My battery seems like it already been used.
552857
Batteries don't seem to have comparable capacity as original battery
324132
Bought this exact same model on the electronics bay - it works but performance less than expected.  After a few charge / discharge cycles to break the battery in, was only able to charge my Galaxy S3 (2100mah capacity) phone from 15% up to 96% (a total of 81% charge added).  I was expecting it to be able to charge it fully with juice to spare.

For comparison, the small lipstick style 2600mah chargers will charge my phone up 50% to 70% depending on model.
1450835
The capacity of the battery was only about 45 min...
In the past my battery would keep going for  3/4 hours while I would do garden work
I am requesting to return it.
I will simply have to plug in on my patio in the future
2453234
Poor performance. Original Battery will last 8 hours.  This replacement is ridiculously to short of battery life. Fully charged I got about 2 hours of battery life.  Also have  in mind that as you recharged your battery and it ages this number will drastically get lower and lower. I do not recommend this product. Look for a better option with longer charge hold.