Sanyo 2,700 mAh AA NiMH Rechargeable Batteries (4-Pack)
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Digital Cameras Photo Reviews of Sanyo 2,700 mAh AA NiMH Rechargeable Batteries (4-Pack)
Customer Review: The Sanyo 2700s are better by a mile than Eneloop 2000 mAh Low self-discharge (LSD) batts
Summary: 5 Stars
Review of Sanyo 2700 mAh High capacity rechargeable batteries
I recently Purchased 2 sets of these for an Olympus SP-550UZ 7.1MP Digital Camera with Dual Image Stabilized 18x Optical Zoom camera. This camera eats up batteries. You can put a brand new set of alkaline energizers in the camera and it will power up just long enough to let you know that it thinks the batteries are dead.
I have been using the Sanyo Eneloop 2000 mAh Low self-discharge (LSD) for several months. They work but not well. I have to take them right out of the charger and put them into the camera to get 250 shots. If the Eneloops have been charged and have been sitting for 24 hours the camera says they are low on charge and I might get 30 shots.
The Sanyo 2700s are better by a mile. For the first time ever I powered up the camera the next day, after using it the prior day, and the camera did not complain that the batteries were about to die.
I highly recommend these batteries for applications where lots of power is needed.
I also highly recommend using a La Crosse Technology BC-900 on it's default setting which trickle charges the batteries at 200 mAh. To fully charge a set of batteries takes around 13.5 hours, but because the Olympus SP-550UZ can't use the battery's full charge, toping the batteries of only takes about 5 hours or less.
May 14 2009 update.
These batteries need to be run down and recharged to get the full use of them. The first time I charged these up I only got 84 shots. After using the La Crosse Technology BC-900's discharge and recharge option several times I got 212 shots out of a set the other day. On this shoot I was using the zoom a lot and that uses a lot of power.
I shoot RAW so on a 2GB type H card I get about 196 shots. So getting 212 shots out of a set of these batteries is great.
I also have tested running batteries dead. When a battery is run down all the way and left for a while it tends to develop micro shorts in it. To a charger it will look dead and the charger won't charge it.
Well I found that if I just left the dead battery in the La Crosse Technology BC-900 charger long enough, sometimes over night, It would start charging eventually. The charger charges at 200 mAh by default and runs a trickle charge of 20 mAh to keep a battery toped off. I suspect that even though the charger does not recognize the presence of a dead battery it is still running a small charge through it. This charge is enough to fix the micro shorts over time and then the battery will start charging normally.
Customer Review: Sanyo 2700 mAh - one of the best
Summary: 4 Stars
These are quality batteries w/ 2x's more power and [Longer RUNNING time] than most lower capacity NIMH batteries, including the "ready to use"/ Low self-discharge (LSD) types!
Never thought I would care about writing battery reviews, but the High capacity rechargeables are getting a bad rap from some reviewers b/c they have to be charged (before) use, in order to get back their capacity, after being left (un-used) for more than ~ 3-4wks. Their stored power when [NOT in USE / device turned OFF] is lost faster than batts that keep hold of theirs longer = the LSD types like Imedion 2100 mAh -or- Eneloop 2000 mAh.
-BUT these high capacity batts (2700- 2900 mAh) have an intended purpose, which is a reason the top companies make Both types in the 1st place.
[In Storage]
Yes, the LSDs are useful b/c they have a [Longer STORAGE time] (before needing to be recharged) than the high capacity types. Thus the LSDs are "ready to use" and good for seldom used devices & intermittent usage. However, this doesn't negate the effectiveness of 2700-2900 mAH made by quality brands.
[In Operation]
Not all users (all the time) need a rechargeable for good shelf-life... Some need it for High power & LONG run time for "shorter" segments = 1- 20 days (i.e., photo shoot, day-hike/bike/caving, day at the beach with ur RC (radio-controlled) toys, holiday lighting, etc, etc. And a quality brand (2700-2900 mAh) will do the job.
The decision is [WHEN] do you pick a :(High Capacity/ high self-discharge) -or- (Low Capacity/ Low Self- discharge)...Not picking the universal "better" one. The "best" would be a High capacity & LSD & Rechargeable all in one!- but that's not available yet.
Now, Sanyo's REAL competition is ( Powerex AA 2700mAh NiMH ). They're both good -I would pick 1 over the other, based on sale price or latest technology release.
Customer Review: The strongest NiMH batteries available
Summary: 5 Stars
First off - you need a good charger to get the most out of these batteries. Check out the BC-900 charger or the Maha chargers that have a display and can refresh or break-in a set of batteries.
After reading the other reviews of this battery and having used Sanyo's awesome Eneloop battery, I had to give these a try in my external flash.
Since I shoot weddings, I need something that helps speed up my flash recycle time and can last all day. These batteries fit that bill, and then some.
When I first got them and put them in the BC-900 charger (if you don't have one, get one - it's great.) That charger has a refresh mode that they recommend for new NiMH batteries to break them in. The first pass showed somewhere around 1500-1700mAh, so I was obviously a little concerned. I have two of those chargers and two sets of these batteries so I set one full set to 1000/500 cycle and the other set to 700/350 (BC-900 owners will know what this means.) After letting them run all afternoon and overnight, the 1000/500 set came out between 2610-2720mAh. The 700/350 set is hitting a high of 2760mAh but the whole set hasn't finished yet so it may go even higher.
Some brands increased the size of the battery slightly to be able to jam more capacity into the battery. Sanyo appears to adhere to the original AA size so getting them stuck shouldn't be an issue.
As of right now, Sanyo is definitely the king of the rechargeable battery hill. If you need a battery that can hold a charge for a long period of time, check out the Sanyo Eneloop battery.
Customer Review: Not worth the 2700!
Summary: 2 Stars
Update as of 07/23/2010 - 2 of the 4 batteries went dead in 2-3 months' time. Can't recommend this!
Original post after the separator below.
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Hi... I researched a lot before buying a rechargeable battery especially when my energizer get 'de-energized' barely a month while lying in my drawer without being used! I found out that Sanyo was currently the best, so I ordered the 2700mAh high capacity and 2000mAh precharged (eneloop, white label), low discharge batteries. Here is what I observed after charging the batteries and observing them with a digital multimeter, after 2-3 weeks while stored in my shelf without being used:
2700mAh battery had 1.31V and about 2100mAh capacity.
The 2000mAh batteries had about 1.39V and about 1900mAH current.
My verdict: the 2700mAh is really not the 2700 capacity, but slightly better than slow discharge PROVIDED you want to charge and use the battery immediately. In my case, I use batteries occasionally and so the low discharge eneloop ones are better since there is always some charge left whenever i want to use the batteries, enough to allow me to click several pictures with my digital camera. Moreover, I hate to see batteries in low charge state whenever I want to use them, so for me the pre-charged eneloop ones work best as then can retain charge for several months. In my opinion, due to practical situations, the precharged, low discharge eneloop are better, but in case you would like to have a little more juice in batteries and want to use it for immediate use, go for the 2700mAh.
Customer Review: VERY GOOD QUALITY - MUCH CHEAPER ELSEWHERE
Summary: 5 Stars
Sanyo batteries are very high quality. Same goes for the MAHA-PowerX, and Ansmann brands. I suspect, but can't prove that MAHA-PowerX and Ansmann sell rebranded Sanyo batteries. MAHA-PowerX and Ansmann are very high quality charger manufacturers that offer only high quality batteries for sale to keep their good reputations. Keep away from Duracell, Lenmar, R2G, Energizer, all no-name models, all regular-(self-)discharge AA's with less than 2400 mAHr capacity, all regular-(self-)discharge AAA's with less than 1000 mAHr capacity.
You may want to substitute with the relatively new technology "low discharge" types of NiMH. This simply means they hold their charges much longer than standard NiMH batteries *when not being used*. That's why they are often advertized as being "pre-charged" - typically to 75% of the full capacity. The only downside is they don't have quite as much capacity as the standard type: 2100 mAHr verses 2600 mAHr for AA's and 800 mAHr vs. 1000 mAHr for AAA's. Great for cameras that stay in the closet for months then suddenly get used heavily at birthday parties. Not good for FRS (family use) or GMRS (business use) radios that need to be recharged each day anyway. Low-discharge brand names and models: Sanyo Eneloop, Accupower AccuEvolution, Ultralast Hybrio, Uniross Hybrio, Nexcell energyOn, Tenergy R2U, MAHA-PowerX Imedion, Ansmann Max-e, Rayovac Hybrid 2100.