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Energizer Er-P511 Replaces Panasonic P-P511Y | 
 enlarge | Brand: Technuity
Category: CE
List Price: $19.99
Buy New: $8.98
You Save: $11.01 (55%)
New (27) from $2.09
Avg. Customer Rating:  32 reviews
Media: Electronics
Autographed: No
Memorabilia: No
Number Of Items: 1
Batteries Included: No
Shipping Weight (lbs): 1.2
Dimensions (in): 4.3 x 3.8 x 1.3
Legal Disclaimer: Warranty does not cover misuse of product.
Warranty: Limited lifetime warranty
MPN: ER-P511
Model: ER-P511
UPC: 809143141287
EAN: 0809143141287
Availability: Usually ships in 2 to 3 days
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Product Description
Energizer cordless phone batteries offer the long life and consistently reliable performance you need to get the most out of your cordless phone, thanks to advanced engineering and state-of-the-art manufacturing.This battery is compatible with Panasonic P-P511 battery.For a complete compatibility list please refer to the original manufacturer's web site.
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| Customer Reviews: Read 27 more reviews...
 Replace those Panasonic batteries with these!! November 28, 2005
51 out of 52 found this review helpful
Having considered dumping my four Panasonic phones just because the batteries continued to recharge poorly and not last long when recharged, I am very happy to find that my 'last chance' change to the Energizer appears to be a great improvement! And they have saved me the cost of buying a new phone system so they are a bargain as well!
At this point I have two of my four Panasonic phones using the new Energizer batteries. The results are clearly better. First, the extra amperage (Energizers pack 1200mA vs. the Panasonic 850mA batteries) definitely translates into longer talk time between charges. No comparison, at least in our experience. And the better battery technology (Energizer NiMH vs. Panasonic's memory-effect-prone NiCad) does charge up fully every time.
As a completely unexpected and added bonus that I cannot explain, the range of the phones is better! Maybe it is the extra amperage - I do not know - but the very same phone in the very same room where I ALWAYS had static and poor reception is now perfectly clear using the Energizer battery! Now that is a very nice plus, especially since this is in my home office!
So I highly recommend trying these before you give up and toss your phones out like I was about to do! If your experience is like mine, you just may like your Panasonic phone again!
 3 AA NiMH batteries, packing tape, aluminum foil, and scissors is all you need October 11, 2005
45 out of 52 found this review helpful
Tired of paying through the nose for these proprietary format batteries that deliver far less power than what is available out there in standard battery sizes ?
Well, make your own battery!
It turns out that this particular battery, designed to replace the dreadful OEM Panasonic P-P511 battery (a NiCad 850mAH battery), is pretty easy to build yourself, as long as you are somewhat handy with arts and crafts. You don't have to know too much about electronics to build this battery.
First of all, save the original P-P511 battery that came with your phone. Study it. The P-P511 battery is essentially made of three AA batteries linked together in series. Linking batteries in series just requires that the minus pole of one battery contact the positive pole of the next battery, and so on. These links can be made by using wires or strips of metal.
Take an Exacto knife or something similar and cut/peel away the outer plastic wrap of the battery. The bottom part of this old battery will have a hard plastic frame that holds the three AA batteries together. Save this plastic frame for re-use.
Next, note how the original three AA batteries are linked together. The alignment of the three batteries is such that the one on the left will have the minus pole down, the one in the middle will also have the minus pole down, and the one on the right will have the positive pole down. The plastic holder has two holes, one in the middle, and one on the right side to allow the middle battery's minus pole to contact the handset's spring leads, and the right side battery's positive pole to contact the handset's spring leads.
OK, so now all you've got to do is figure out how to hook up the batteries in series so that these two battery poles end up at each end of this daisy chain series.
Take heavy duty packing tape and some heavy duty aluminum foil (the kind that comes in the large heavy duty lengths work fine), and cut small 1/4 inch strips. Tape the end of one such aluminum strip to the minus pole of what will be the left hand battery. Run this aluminum strip flush along the body of the left battery to the other end of the battery, and tape the other end of the aluminum strip to the positive pole of the middle battery.
Next, tape these two batteries to the plastic frame holder and cover up the aluminum foil generously with some of the packing tape. The next aluminum strip needs to run directly over the positive pole of the middle battery without making any electrical contact with it, so the positive pole of this middle battery needs to be well covered with tape and insulated.
So, tape down one end of a strip of aluminum foil to the top minus pole of the right hand battery, and run the foil strip across the top of the middle battery, and make contact with the bare positive pole of the left hand battery. Tape dowm the aluminum foil to the top of the left hand battery.
Tape the right hand battery to the other two batteries and the frame, and then wrap the whole group of three batteries in tape again, just to make sure the whole thing stays together.
Voila! You've made your own P-P511 battery!
The reason for doing all of this is of course that the technology for NiMH batteries has far outstripped what is being offered in this battery here (only 1200 mAH!), and you can make yourself a far better battery.
The batteries that I used were Everyready Energizer 2500 mAH NiMH type. Way better than the original, way better than this Everyready ER-P511!
Replace those horrible Panasonic batteries with this one August 15, 2005
33 out of 34 found this review helpful
The batteries that come with the Panasonic phone are terrible, dying very quickly. After several frustrating months and having replaced them twice, we tried this battery and it's 1000 times better! Highly recommended.
The heck with these expensive batteries. Make your own replacement battery! March 7, 2006
14 out of 20 found this review helpful
One star because they are too expensive for what you get. You can make them cheaper:
I own 5 Panasonic KX-TG2720 telephones. I bought them new on clearance for $20 a piece. They were probably on clearance since they came with the terrible, Panasonic P-P511 Nickel Cadmium recharable batteries that lasted less than 6 months. NiCad batteries are terrible since they are plagued by "memory" and a relatively short life span. This is likely why Panasonic discontinued the P-P511 NiCad and replaced it with the HHR-P402 Nickel Metal Hydride. This step was an improvement but it should have come with the phone in the first place.
Replacement battery packs for Panasonic phones are not cheap. They generally run over $10 a piece. Therefore, I took DarthRad's advice below and made my own using Duracell DC1500 2500mAh NiMH batteries. I bought four 4-packs for about $28 and made 5 replacement recharable battery packs for the Panasonic phones. Since each recharable battery pack uses 3 batteries, I had one left over.
I embarked on this project for 3 reasons:
1. You can save a lot of money
2. You can make a far better recharable battery pack since even the ER-P511 is only 1500mAh as opposed to the Duracells which are 2500mAh (this translates into longer talk time and increased range)
3. I like excuses to the use a soldering iron.
I will not repeat DarthRad's great instructions below but I will say that I was able to use all of the materials of my existing NiCad batteries for use when I ran the Duracell's in electrical series. Therefore, I did not need to find some aluminum foil as DarthRad suggested.
I carefully extracted the 2 strips of thin aluminum. (For the purposes of description, if you open the back of the handset, battery #1 is on the left and the bottom of battery #1 is covered by the plastic at the bottom.) There is one aluminum strip on the top between battery #1 and battery #3 and another longer strip that runs from the top of battery #2 to the bottom of battery #1.
Instead of tape, as DarthRad suggested, I used a small amount of solder to hold the aluminum strips in place. I suppose you could use tape but it is not as secure as using a soldering iron.
I will mention that commercial batteries have a small 'nub' on the positive terminal so they are slightly taller than those I replaced in the recharable battery pack that did not have a nub. This really did not matter all that much. They will still fit in the handset. I imagine if you had to use tape to secure the aluminum strips, it may be a tighter squeeze.
THE RESULT: Cheaper, better batteries that last longer and enable a longer range from the base. Plus you have a good sense of accomplishment. ...There is nothing to it. And no, you won't burn down the house. The home made packs are no different in functionality over the ER-P511.
Thought I was going Crazy ! September 6, 2005
10 out of 10 found this review helpful
Finally an answer to my phone problems. Simply one word... Miraculous ! This battery takes care of the phone and has it working better than ever !
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