Customer Reviews

Energizer Er-P511 Replaces Panasonic P-P511Ý

5 star:		(25)
4 star:		(5)
3 star:		(1)
2 star:		(0)
1 star:		(11)

 

 

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!

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.

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!


Addendum - the best NiMH batteries at holding a charge that I've found are the Eneloops by Sanyo. The Energizer NiMH batteries I originally mentioned above turned out to have this bad tendency to lose their charge after a few months. Thanks to the comment by Casey for reminding me to update this review.

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 !

The Energizer ER-P511 Nickel-Metal Hydride Cordless Phone Battery is way better than the NiCd battery that comes with the phone. I had nothing but battery trouble from the day I purchased my phone. The new battery has fixed all my battery problems and is working great!

This battery works as a cordless phone battery should:
-->No 'memory effect' of the standard NiCd battery!

It's like I have A new phone. :)

$7 might be a good deal for this battery, but the shipping and handling charge is $11.50 for one battery, $17.50 for two. I am not sure how the seller, eek Technology can get away with this, but if Amazon doesn't have a problem with it, perhaps they can sell the batteries for $2 each to draw in customers and hope they don't notice the $16.50 S&H charge.

I'll check if Radio Shack sells them locally.

This will last for almost 2 years which is better than the original Panasonic one. Those last for only 3 months. This battery makes the Panasonic phone work as advertised; I could use the speaker phone for the first time. The price is lowest but the shipping is a rip off. I was about to checkout and then noticed the high shipping. Finally brought this from Cyber gift center.

I agree with other reviewers about the very poor performance of the stock panasonic phone batteries. These easily last twice as long! I always hated the short battery life of stock batteries and was ready to get a new phone. The only thing that saved the phone from the trash was that it was expensive and that it came with two handsets that let me switch between them. Since I got these batteries, I haven't had to switch handsets while talking due to a low battery.

These batteries are priced attractively, but eek Technology wants to charge a ridiculous amount for shipping -- almost $23 for 3 of these batteries, shipped by regular ground service.

I questioned them on their shipping price and they claim it's an incorrect product weight on amazon.com and it's impossible for them to change it. But unless someone complains, they're happy to just pocket that extra profit.