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In-depth Look at Palm Pre Super Extended Battery! 2800mAh and Monstrous 3800 mAh, get your Pre running for days.

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Update: Test Result for all Extended Battery for Palm Pre

So you got a Palm Pre, love everything about it but the battery life and maybe the lack of official apps. We know come Fall, the App Catalog will be exploding with cool apps. So only thing left is the battery life. You can buy a 1400mAh Palm Pre extended battery that will add about 20% more juice to your Pre, which we reviewed just days ago. I'm sure this is enough for a day's worth. But if you need your Pre running for 2 or even 3 days with out a single charge, you can go with Amzer's 2800mAh extended battery or Amzer's 3800mAh super extended battery. Both of the 'super extended batteries' comes with their own battery door due to the size increase of the battery. And also note that these back covers are not TouchStone compatible, maybe in the future.

Read on for our In-depth look and comparison of the standard and extended batteries + back cover. And stay tune for our Test results in the coming days. You can read the test results of the 1400mAh here.

Battery Size Difference: 

Right off the bat, you can tell the difference in size. The 3800mAh is about 3x the height of the standard battery, where as the 2800mAh is twice, and the 1400mAh has identical dimensions.

(Side View)

(Back View)

Back Covers (Side View)

The standard back cover is 4mm thin, 2800mAh's is 9mm thin, lastly -- 3800 is 15 mm thick.

(Inside View)

The extended battery back covers feels cheaper, but definitely sturdier.

Photos of the Back covers on the Palm Pre (Bottom View):

(Top View)

(Side View)

(With the Keyboard Opened)

Amzer vs. Seido Battery Door:

Unlike Seido, Amzer preserved the curves that is known for the Pre. And Amzer's battery door has the Piano back finish like the standard back cover (Will attract finger prints), where Seido has a matte finish.

Reason why the extended batteries need their own back cover:

With the 3800mAh back cover on, you Pre is also a wireless/wired mouse:


We haven't tested the super extended batteries yet, but based on our results from the 1400mAh battery, these will offer the extra juice like promised. I'll recommend the 2800mAh over anything else currently on the market, because it offers a lot more battery life vs. Standard, plus it feels really good in the hand, especially while typing. But if you really need even more juice, go for the 3800mAh


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Reader Comments (63)

Wat's the charging time for the 2800?

August 6, 2009 | Unregistered CommenterChefjabril11


We'll post the test results including the charge time soon.

August 6, 2009 | Registered CommenterPreThinking

Does the device creak / squeak at all while typing with the replacement battery covers? wondering about what the extra space does to the feel of the device

August 6, 2009 | Unregistered Commenterl.m.orchard


Perfect fit, no squeaking while typing.

2800mAh back: Gives you a better grip of the phone, feels nice in the hand especially when you're typing.

August 6, 2009 | Registered CommenterPreThinking

Do the battery doors mess with the flash like Seidio's?

August 6, 2009 | Unregistered CommenterDaveC.

@Dave. C

I posted the answer to your question at the end of the post.

August 6, 2009 | Registered CommenterPreThinking

this is what we were looking for, we have 16 pre and we need to buy all these devices 3800 mah as we are using these in field.

thanks love your review.

August 6, 2009 | Unregistered Commenterjoe

Very nice write up. Can't wait for the actual battery test results.

What's under the yellow sticker? Does it say "Amzer" there or is it just plain black underneath. I don't like how Seidio plasters their name on their extended back covers.

August 7, 2009 | Unregistered CommenterMannyZ28

The sticker can be removed with no residue and you won't find anything underneath it.

August 7, 2009 | Registered CommenterPreThinking

Unfortunately there is a ton of wasted volume within the enlarged case. I wish the battery cells were arranged in such a way that they would "spill over" the designated battery pocket once you clear 1400 mah. I wonder if it would interfere with the radio or heat dissipation.

August 7, 2009 | Unregistered CommenterAnon

Thanks for the review & pics.

Only one nit pic: in the side view series, the length of the pre doesn't stay the same. Stock Pre is far away. 2800 pre is slightly closer (making it look bigger) and 3800 pre is closer still, making it look even bigger. This exaggerates the size difference of the battery (IMHO).

But this is just a minor nit. Pics are very useful. The 2800 looks like it might be just about right.

August 7, 2009 | Unregistered Commentermjh

Anon, my guess is that heat dissipation would be impacted. On my pre, the black thing south of the battery is the thing that gets hottest.

August 7, 2009 | Unregistered Commentermjh

Wow, just carry multiple batteries. 99.9999% of people don't need absolute 100% up time anyways.

August 7, 2009 | Unregistered CommenterEric

The phone looks absolutely ludicrous with the 3800mAh battery and cover. Why on earth would anyone want to do that to their phone?

August 7, 2009 | Unregistered CommenterJustin

What happens if you put the standard battery in while using the 2800 cover? That is, do I have to carry around both my original battery and cover to act as a backup, or can I put in the standardr battery using the 2800 cover? I fear the standard battery will fall out.

August 8, 2009 | Unregistered CommenterMiguel


Just tested it, won't fall out no matter what I do with standard battery and 2800 back cover.

August 8, 2009 | Registered CommenterPreThinking

Will there be a touchstone version of these covers? It would be interesting to see how hard it would be to convert them to a touchstone cover.

August 8, 2009 | Unregistered CommenterDavid

Amzer is working on it.

August 8, 2009 | Registered CommenterPreThinking

Any news yet on how well the batteries hold up? Also...any comparison between the Amzer 2800 and the Seidio 2600?

August 8, 2009 | Unregistered CommenterMannyZ28


3800mAh lasting way to long and 2800mAh too. Draining the extended batteries can be such a pain the in neck...

August 8, 2009 | Registered CommenterPreThinking

Is Amzer a reliable company? Where are the batteries made?

August 8, 2009 | Unregistered Commenterrishio


Amzer have been around for 6 years, and the batteries I got from them are working really good. I think all aftermarket extended batteries for the Pre are made from China.

August 8, 2009 | Registered CommenterPreThinking in other words, you are pleased with them? A 2800 should be good for a whole day with HEAVY usage?

August 9, 2009 | Unregistered CommenterMannyZ28

How can I use my holster if I bought the 2800 Mah battery? Or will they be making a holster that the 2800 Mah can fit in. I like the holster because it is a shell that protects the palm pre all around and, if I do purchase this extended battery, I would still like to protect my investment.

August 9, 2009 | Unregistered CommenterNicky-Fingers

Wow i was on the edge of getting the pre because of battery life, but these just launched me on the decision.

August 10, 2009 | Unregistered CommenterShane

You can use the extra space behind the door of the 3800 to hide your stash : )

August 10, 2009 | Unregistered Commenterrajun asian

Yes, I have the Seidio 2600mAh battery with cover, and the flash is nullified by this back case because there is no plastic to make the flash 'flush' to the case, making the glare from the side of the LED shine directly into the lens of the camera. I wish I had gotten the other company's battery/case... Oh well, nothing like a self-mod!

August 11, 2009 | Unregistered CommenterChad

Any update on the extended battery tests?

August 11, 2009 | Unregistered CommenterChristian


It will take only a day after I finish the battery cycles. So before the end of this week.

August 11, 2009 | Registered CommenterPreThinking

Why the h... didn't they just make it bigger - covering the whole back of the Pre? - the battery should simply BE the back cover instead of an extra cover with ALOT of empty space beneath it.

It would make the battery twice as large/lasting.

August 12, 2009 | Unregistered CommenterDF

Do the amzer battery doors muzzle the sound? the holes where the speaker is look smaller than the size of the speaker inside the phone. Seems significantly smaller than the opening on the stock door. Any comments on this? I want to get the 2800, and ive heard that the seidio messes with the camera flash, but the speaker opening looks liike it matches the stock one perfectly.

August 17, 2009 | Unregistered Commenterviperfiend07

@ Viperfiend07

It sounds the same to me.

August 17, 2009 | Registered CommenterPreThinking

So what ever happened to the battery test results for the 2800 and 3800 batteries? The article was posted over 2 weeks ago.

If the 1400 battery can last 8 straight hours running Pandora, will the 2800 run for 16 hours?

In the mean time how has the 1400 been doing under actual usage.
i.e. on DEFAULT settings and using Google accounts, say an hour on the phone, an hour on the web and two hours of it anywhere near 8 hours time or is it even longer?

Personally, I don't see any reason why it wouldn't be near 12 hours with such mediocre use, but then this is the Palm Pre we are talking about and battery life is an issue. :(

August 23, 2009 | Unregistered CommenterClint

Any word on this? I'm curious how long the new batteries last! Are they worth it?

August 25, 2009 | Unregistered CommenterJoe User

Just got the 2800mAh Seidio extended battery a couple of days ago and let me just tell you, it works great! Usually when I get to work at 9am, spending a few minutes on my phone checking emails and surfing the internet will cause my battery to go down to about 90% by lunch time. Now, I can do the exact same thing and my phone was still at 100% at 4:30pm! But it did drop down to 98% at around 5:00pm. I did the same thing I usually do with this new extended battery as I did with the stock OEM one and when I went to bed at midnight, the extended battery was at 78%. With my OEM battery, I would usually be around 30-40% with the same amount of use. The battery feels great and it isn't very much larger at all, you barely notice the difference and personally, I like the feel of the extended battery feels better talking on the phone and texting/sending emails. I highly recommend it! I just don't recommend the 3800 one...that thing looks way too big!

August 28, 2009 | Unregistered CommenterLee

Sorry, I meant to say the Seidio 2600 mAh, not the 2800. I trust the Seidio brand over the the Amzer one. They make some of the best phone batteries on the market today.

August 28, 2009 | Unregistered CommenterLee

I'm waiting for an extended battery with Touchstone. I will live with charging often until then, Touchstone is just too cool not to use.

August 31, 2009 | Unregistered CommenterRick

Are you guys working on making a snap on case that can support the palm pre with the extended batteries. I would like to see this product on the market because I have a snap on case for the pre with the standard battery and it works great with the holster that came with it. Im just wondering if you guys are working on creating one for the 2800 and the 3800 extended battery to fit.


September 2, 2009 | Unregistered CommenterNicky-Fingers

I bought an extended battery from Seidio or whatever. I haven't got it yet. Can you tell me why I should pick this brand over the other?

September 2, 2009 | Unregistered CommenterAlexis

Any word on Touchstone compatibility yet? It's the only thing holding me back from buying one.

September 12, 2009 | Unregistered Commentervara411

Any news yet on the extended battery run time (Amzer 2800 and 3800)?

Will there be a touchstone coming out for the 2800/3800?

September 16, 2009 | Unregistered Commenterdonhenl

I don't know, I got the 2600 mAh from Seidio and it doesn't seem to mess with the flash at all. It might be they've updated the backing or something or maybe I'm just not noticing it. I like the rubberized grip and 2600mAh lasts me a long time even with pretty heavy use. I'm sure the Amzer one is fine too but I wanted the rubbery grip. So far I don't regret my purchase but I'd like to know: Is the Amzer 2800 any thicker than Seidio's 2600?

September 18, 2009 | Unregistered CommenterRandomPalmPreUser

My Seidio 2600 mAh battery doesn't affect my flash either, the backing is designed perfectly so that the flash and camera isn't interfered with. I've had my battery for a few weeks now and I am very happy so far. The battery can easily last me an entire day with plenty of power to spare.

September 22, 2009 | Unregistered CommenterLee

Thanks for the review. It contributed to me buying the Seidio 2600 mAh battery and I've been very satisfied with it. I don't have a touchstone and with the battery drain I was experiencing it was either return the Pre or get the extended battery. While the touchstone is cool, it wasn't practical for me to spend $70 on it + still need to buy another USB cable to expand my charging options.

For that money I was able to get the extended battery w/cover and 2 compatible USB chargers to leave one at work, home and in my computer case. I rarely use the car charger now unless I'm traveling. With the original battery I would teeter on 10-20% any time I wasn't consciously recharging at every plug I had access to. Now I can charge over night and it usually gets me through the day w/o hitting 40%. I have hit 10% a few times, but the extra power gives me so much more freedom to USE the phone in all her glory w/o regard to drain. I also ordered the charging kit that allows charging one battery in the phone while charging the spare in a dock, but now I don't really need it. I got it because I didn't like the idea of having to swap batteries daily to charge - I can't imagine those cases were designed to be clipped on and off so much - but given the life I'm getting now, I probably won't use it except when I prepare for trips to get the original Pre battery fully charged.

RE: flash - I haven't noticed any issue WRT the ext batt cover and flash photos but I just did a test and there is a bit of flare on the edges from the flash hitting the case. It improved when I cleaned the lens :) but did not go away. As a testament to the quality of the camera - it does a good job w/o flash, even in what I would consider moderately lit conditions, so no flash is needed for most shots unless in a dark setting. I probably hadn't noticed the flash since I only use flash when I have to and I only had 2 shots out of 52 that had any flare.

Now to find a suitable holster or belt clip for the extended battery size - which is why I popped up here today.

September 23, 2009 | Unregistered Commenter@SheilaJobe

I don't get why some of the posters even bought an extended battery if they still have 90-100% at noon. The standard battery would have been sufficient with such light use.
My OEM battery completely runs out & i'm left with that stupid black screen with a silhouette of a battery before noon most days if I'm not able to charge. Not only that, I've drained my car battery so many times while charging the pre I finally had to buy a new one. Tonight was the 3rd time I had to ask for a jump from strangers because now I'm killing my brand-new car battery.
I really don't care how thick the pre looks with the 3800 as long as it really lasts 3x as long. Perhaps with it I won't run out of power until 9 or 10 in the evening.
I'm not a real heavy internet user, I've never played a single song through a pda, I don't play games, and I don't use wifi. I DO have to talk 3 or 4 hrs per day on the phone, and access hella info/files/notes while at it, so it's not uncommon to have 7000 to 8000-minute months. I really hope the product works as billed...

October 13, 2009 | Unregistered CommenterUltraHeavyUser

I bought a 3800mAh battery last week. Yes it is big.. but I cannot drain it fully in 24hrs.. THAT IS AMAZING. I have my Pre settings configured with Bluetooth on, screen light maxumum, GPS on, IM off, Sprint navigation on, 25 email addresses delivered as they arrive, normal web browsing... all for 24hrs !! Then I turn on the TV and watch until I get bored watching TV and then I listen to a few 30-minutes podcasts while I drive. The battery still does NOT fully drain to zero. Just amazing. The reason I bought the 3800mAh is because I want to travel with no tether. For example, if I am around town walking for a day, or if I am hiking for a few days, or if I am in someone else's car without my touchstone installed in the car. This battery more than suffices for the job.

October 16, 2009 | Unregistered CommenterRick

I forgot to mention one problem though.. it takes me 5 to 10 hours to charge the battery using my 1000mA OEM palm A/C charger. Does anyone know what would happen if I try a 2000mA charger instead.. I'm trying to speed up my charging time.

October 16, 2009 | Unregistered CommenterRick

That's what I needed to hear. Thanks, Rick. Just pulled the trigger and bought the 3800 as soon as I read this. Perhaps I'll look like I'm carrying a volkswagon bug in my pocket--hey, as long as this battery can make the pre do what the palm designers couldn't, I'll be a happy camper.
I can just hear my customers now: "Is that a PALM in your pocket or are you just happy to see me?"

October 23, 2009 | Unregistered CommenterUltraHeavyUser

Hey UltraHeavyUser, I even put metal stickers on the back of the 3800 battery cover and now afix my Palm Pre to the magnet in my car. then I just just pull the phone off the magnet and walk away. It all works just great. Too bad Palm doesn't SHOW this productivity in it's commercials, instead they show that freaky weird girl in a meadow, not even close to the reality you and I live in.

October 24, 2009 | Unregistered CommenterRick

Almost forgot.. Look for an app called QUICK SYSTEM TASKS. It handles WebOS's Data, WiFi, Bluetooth, GPS, AirplaneMode and Screen Brightness toggling into one spot and runs both in Card mode and Dashboard mode. This app makes saving battery power a real cinch.

October 24, 2009 | Unregistered CommenterRick

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