[Galaxy S II Accessories] waylaidwanderer:
Update: As stated in one of my posts, I will be posting updates one a day for the first week, one every two days for the rest of the first month, and then one a week (hopefully every Sunday) for the rest of the months. Look forward to it ;)

Review of 3500 mAh Extended Battery for Samsung Galaxy S II

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Changelog:

05/04/12 - Updated with Days 5 & 6
03/04/12 - Updated with Day Three and Day Four
01/04/12 - Updated with Day Two

I bought an extended battery (3500 mAh) from eBay for about $7 CAD, and it finally arrived the day before yesterday.

When I put it into my phone it was already at 74%. After charging it overnight, I started using it the next day at around 7:30 AM.

Before I post the screenshots of my extended battery (Edit: if anyone is wondering, data is usually always on, and brightness is set to Auto), let's have a look at the original stock 1650 mAh Samsung battery life:

Stock Samsung 1650 mAh Battery:

With some simple math, at 9% remaining, this would have lasted me just over 7 hours before reaching 0%.

Conditions of usage:

As you can see, I like to use my phone a lot with 76% screen time :). I barely used my data/wifi. Data was on but not active, and most of the screen time was spent on Moon+ Reader.

Time lasted:

On an average day, (I use data a lot and I play games) I would get about 5 h 45 min or less out of my phone. As you can see from the screenshots above, this wasn't really an average day so it lasted longer, which is reasonable as I did not use data very much.

ROM info:

Westcrip's Resurrection Remix ICS Pro 1.0 with the kernel that comes with it.

Now let's compare this with the battery life of the 3500 mAh battery.

3500 mAh Extended Battery

Day 1 [30/03/12]:

Time lasted:

A whopping 9 hours 20 minutes.

Conditions of usage:

As you can see I was connected to wifi most of the time, and unlike the previous screenshots, I was using wifi/data a lot. I don't know why it says screen time is only 28% though because as you can see in the second picture I had "screen on" a lot.

A charge cycle has Battery Monitor reporting this battery's estimated/measured mAh to be 3074 mAh.

Only 500 mAh difference from advertised capacity, but not bad for $7, if I do say so myself. :D And this is only the first charge/discharge cycle, so I expect an increase in a couple days.

ROM info:

AOKP (bezke's), with Siyah Kernel for ICS beta 7.

Day Two [31/03/12]:

This is the result of the second day of using the extended battery:

Time lasted:

8 hours and 30 minutes.

Conditions of usage:

Now as you can probably tell I've used my phone a lot more today, with screen on at 40%. I had a lot of free time, so I was pretty much constantly on my phone, using data and also listening to music (through external speakers just below medium volume). Still not bad compared to stock battery. Data was always on, and brightness set to auto, and music was playing through the speakers for about under two hours.

ROM info:

AOKP (bezke's), with Siyah Kernel for ICS beta 7.

Day 3 [01/04/12]:

Now a bit of a funny/interesting story here. :p First, let's see the screenshots and I'll explain:

Seems pretty standard here. But I decided to turn off wifi and data and keep using it a bit, just for texting and reading ebooks. And when the screen was off, I managed to get it into ~97% deep sleep. So, this was the final result before the battery died.

Almost a whole extra hour usage, and here is CPU Spy's report on Deep Sleep. :D However, this is not standard. If you're like me, you like using your phone a lot. So we won't count this last screenshot. :p

Time lasted:

9 hours and 6 minutes.

Conditions of usage:

Standard again as usual, but screen time is a bit higher. Unfortunately as a user requested I forgot to take a screenshot of the screen time. I will do it for the next day though. :) In the meantime, get out your calculator, haha.

ROM info:

HyDrOG3N-ICS (AOKP), with latest codeworkx kernel.

Day 4 [02/04/12]:

This is the fourth day result.

Screen time screenshot included as requested. :)

Time lasted:

7 hours 35 minutes.

Conditions of usage:

Today's usage was not very standard at all. I used data almost constantly today, and played around with Cerberus which also consumed a bit of battery life through the GPS and data/wifi. Phone got pretty hot through the constant usage which I hear drains battery faster. I also watched some videos and flash videos too.

ROM info:

HyDrOG3N-ICS (AOKP), with NEAK 2.0.1 kernel.

Day 5 [03/04/12]:

Unfortunately there won't be any screenshots for today. My phone crashed and somehow the battery usage got reset, so there's no point. There will still be a report for today as per usual of course. :)

Time lasted:

From 7:30 AM to 4:30 PM, the battery lasted me about 9 hours.

Conditions of usage:

Not much to say really. Conditions were normal, and so was the time the battery lasted. ~9 hours, occasionally less, seem to be becoming standard.

ROM info:

HyDrOG3N ICS (AOKP) with SiyahKernel v3.0rc2.

Day 6 [04/04/12]:

Here's the report for Day 6. And as you will see, wow, the results aren't standard at all. Also included is Battery Monitor's report on the measured mAh along with details for Screen time.

Time lasted:

7 hours and 2 minutes.

Conditions of usage:

7 hours isn't very standard at all. It's a pretty wide deviation from the norm, but my explanation for this is that I was very very bored. :p As you can see from the "Screen" time, it says 48% but I actually used it for 5 hours and 6 minutes, which is an astounding 72.5% of screen on time. I amaze myself sometimes. :rolleyes: So data was always on but not constantly active, and I played some flash videos and even a flash game, and I was testing out GPS on HyDrOG3N ICS (which sucked at getting a lock-on) so all these factors drained my battery. I also watched some videos on my phone as well.

ROM info:

HyDrOG3N ICS (AOKP) with SiyahKernel v3.0rc2.

So in conclusion:

This battery seems well worth it. I am very satisfied with the battery life, and if you are a person who likes to play with his phone a lot (games, Reddit all day, browse the internet), then I recommend this phone as it will last you a good amount of time without needing a charge.

I will be continuing to post updates and screen shots this week as I continue using this battery. Subscribe and look forward to it!