HTC Thunderbolt Battery

Ever since the Droid Incredible was first released, we have heard about bump charging, and many of us are left wondering what is it, and how does one accomplish such a thing? If you have ever taken your Incredible or Thunderbolt off the charger and noticed that nearly instantly you were down to 90 percent showing on your battery meter, and were puzzled.

Well, the device charges itself fully, but does not maintain that full charge, instead keeping around a 90- to 95-percent charge and showing full. So, people have begun bump charging their device to gain that last five to ten percent back. There are a few developers who are taking stabs at making custom kernels that will combat this, but that requires root, and flashing files, and all that jazz, so they have an alternative bump charging method, which goes as follows:

  1. Power up (if not already) and plug your device into a power source. As the battery is being charged, the notification LED shows a solid orange light.
  2. Wait until LED is solid green, indicating it is fully charged.
  3. Unplug, press and hold the power button, and select the option to power off.
  4. Once powered down reconnect power source.
  5. The LED will show a solid orange light again, indicating it is charging.
  6. Once it's green, unplug the device and use the power button to power up the device.
  7. Once Sense has loaded plug the phone back in again. You will notice that the LED is now orange again.
  8. Repeat steps 3-7 process until the light is green immediately upon plugging it back in (approximately 3-4 times).

So, if you want to ensure that you are starting your day out with truly 100% battery life, follow the simple steps above, but you will unfortunately have to do this each and every time the device needs to be charged.

Source: Android Central Forums


Reader comments

Bump Charging: What it is and how to do it


Haha you're stupid. All modern cell phone batteries drain down themselves like this. Such a good reason to ditch htc...

Correct. To go into detail a little more, the software is meant to discharge energy quickly for the first 5-20%. This allows the battery to last much longer for the long term.

I highly recommend not bump charging unless you expect to buy new batteries every six months or so. Jared should have done some more research and put a warning on this post.

Really? what difference does 5% make? who has time to eff around with all that. i have my device to use it, not power cycle it over and over to get 5 more percent of battery.

Further, there is a lot of information out there that says this is a bad idea, and not good for your battery:

See XDA post on this subject here.

See Battery University:

Lithium-ion suffers stress when exposed to heat and kept at a high charge voltage.
Elevated temperature is anything that dwells above 30°C (86°F), and a high voltage is higher than 4.10V/cell. When estimating longevity, these conditions are difficult to assess because the battery state is in constant flux, and so is the temperature in which it operates. Exposing the battery to high temperature and being at full state-of-charge for an extended time can be more damaging than cycling.

You are far better off in the long run to just top it off a bit as you get the chance, than you are forcing the battery to 100%.

When I fill my gas tank, it's full otherwise the pump cheated me. So why should I buy a product that cheats me out as well. If the Battery is not getting a full charge why buy the phone. Yet another glaring issue.

Because then you will end up with a battery that wont hold a charge in 6 months smart guy. Just like the fools that leave their laptops plugged in all the time without pulling the battery? Why does my computer die in 45 minutes?! Cause your a Dumas that's why.

I would disagree with your analogy. Because if you let the pump fill your tonk on its own it will shut itself off after the set back pressure is met in the tank. However, you know as well as I do that if you sit there and keep tapping the handle you can get almost another gallon if you are persistent. And if you have a 20 gallon tank, then you would be 95% full before you decide to top it off.

well im doing the battery stat wipe method today to see if its any different other then that I have accepeted the fact im using a mini computer in my pocket so battery life is what it is. Enjoy your phones the way using rooted dinc on ruby rom since 720p hasn't landed on cm7 yet

I do it if I know I'm in for a long day of use and I didn't charge any of my spares. However, I could have sworn its been said that this shortens the overall life of the battery.

MacBooks do this. Apple's explanation: "The batteries used in these computers are designed to avoid short discharge/charge cycles in order to prolong the overall life of the battery." I don't think forcing it to 100% everytime would be very good for the battery.

Not sure why people view this as an issue, HTC is actually doing us a favor. They are prolonging the life of your battery by not overcharging it every night. Also, you can achieve the same thing as above and regain your 100% by just unplugging the phone and plugging it back in.

I have an EVO, and I have been doing this for quite some time now. Works great and I would rather HTC continue to implement this battery saving option as my battery life is still great after almost a year.

Since reading this post, I've wondered the same thing because I notice that I can unplug my ThunderBolt for five minutes, plug it back in, and the light stays amber for fifteen minutes.

Do you really have to power up and back down again that many times to achieve this? I thought once you had the device charged as full as it would go while powered on, you would power down, then charge until the light turns green, unplug, replug and wait until green again, then unplug, etc. for 7-8 times.

What would be the reason of powering up, charging, powering down, charging, powering up, charging, etc.?

On my Evo, the green light indicating that it has reached 100% will come on but that does not mean it's at 100%. If you use Battery Monitor Widget and go into History you will see that there is both positive and negative mAs.

I've noticed that once it's green it will for several hours still charge, indicated by the +mAs. Once it's fully charged you will start to noticed -mAs, indicating it's now discharging. Once the phone gets to this state it will switch between charging and discharging every few minutes.

I've never understood this bump charging method because it's not doing anything that leaving the phone on the charger doesn't accomplish. Also, I'm quite surprised that this article makes mention of modified kernels that attempt to fix this "issue." Those modified kernels, last I read of them, fry batteries because lipo batteries are not meant to be trickle charged.

If you take your phone off the charger as soon as it turns green, yes it will drop to 90% rather quickly because it isn't at 100% yet. However, if you leave it on the charger you will get as close to 100% as possible.

yes thats how all moder cellphones work, my Motorola Atrix does the same thing my old blackberry bold 9700 and bold 9000 did that. a simple google search will give you enough info on this subject. this 5% doesnt make a diff anyway.

I have the 1750 battery, runs all day with moderate to heavy use. I charge a little at lunch time, then charge overnight. Have had no issue this way.

Hmm, it amazes me that people will go through so much work when they can just have an extra battery. If I was an iPhone user, this maybe important, but I'm a Thunderbolt user and I can open my case, replace the battery and they are cheap!

Some of the comments here are really stupid. You left HTC because they cheated you out of an hour or so of extra battery life?

Bump charging is no different than putting your battery on an external charger. Your phone will say it's done, put the battery on an external and it will charger longer.

All these steps are not needed anyway to bump charge. Just power down and wait for the light to turn green again.

I would expect a successful blog like smartphone experts and in this case Androidcentral to really look into this and do some research before posting a pretty controversial topic in the Developer community. I, myself, use a SBC kernel and have not had any issues. But I totally understand where and how people can be on either side if this topic. I wish the writer of this topic would have really done his homework before posting this. There is a difference from a walkthrough found in every android forum to actually seeking facts from mobile phone developers like HTC MOTO, Samsung as to why they choose this charging method. And then let the community make an "informed" decision whether bump charging is worth it.

All those crazy bump charging instructions??? Who has time to deal with that??? Download reboot manager/widget by rauesoft. It was the best $1. 99 i ever spent. Plug your phone in before you go to sleep and have reboot manager shutdown your phone an hour or two before you get up. Get up and power on and enjoy at least 25% more battery life. Been doing this for over a month now and my battery life went from 6 hours to 10 hours a day. It doesnt get any simpler than that. No multi power cycling no battery swaps!

I don't think this is good for the battery either. Just like having a task killer. I don't suggest doing either of these things.

I use an external battery charger. If you have a Thunderbolt or an Evo and you're an Android power user, then you have two batteries anyway. I swap them out so that I'm always fresh when I leave the house, and I never have to wait to recharge because there is always a battery with 100% life waiting for me.

Seriously? That's what it takes to be a "power user"? Shutting down your phone to swap batteries?

Undomesticated Equines could not drag me to "Power user" status if that's what it takes.

Why not just plug it in?

Why don't they set 90% as 100% and keep some spare capacity to avoid the issue of 'why isn't this at 100%?' & and ensure the battery lasts longer?

Some of these reponses are rediculous. All modern smartphones DO NOT do this. My iphone 4, when unplugged would stay at 100% for a good hour without use. My atrix, when unplugged, drops from 100% at about 2.5-3% per hour with no use. My incredible, which both the OEM and the Extended battery, would drop from 100% to 90% within 15 mintues with no use. HTC phones have this issue for sure and its trully mind boggling why they havent been able to fix the problem. You can explain it away any way you want, but when there are competing phones that do not behave this way, there is not much you can say to defend it.

Perhaps its just a display issue and at the end of the day your NET usage would be the same if it didnt drop so fast, but its annoying regardless.

I have bought 4 of those China batteries - 2 for my Samsung Moment and 2 for my Samsung Epic and had one of each lasted only 2 hours so I tossed them and the other one of each lasted for about 4 hours each that is slowly going away.

I actually did not buy them for the batteries, but bought them so I could get the chargers that they came with - so for me it was really no loss as they were really cheap - $6'ish dollars for one battery and charger - love the chargers! All 4 chargers and 4 cheap batteries for less then the price of 1 Samsung OEM battery. I then purchased True original Samsung OEM batteries on ebay for about approximately $12 each.

Each phone has 3 batteries, 1 in the phone and 2 ready to go batteries in their own respective chargers. I simply pop a new battery in every morning and hardly ever use the corded charger unless I need a quick bump, that is if you can call the Samsung inphone charging a quick bump :(

I just use the standard stock Samsung batteries and simply rotate them - it works best for me and stays at 100% in the phone for at least 30 to 45min depending on light use - unlike when I charge them in the phone, and when I unplug them they always drop immediately to 96% to 98% even when I try to bump charge which is a pain in the butt and hardly ever works. This has been a problem for me since PalmOS and was cured by simply using external chargers. The batteries in my testing also seem to last longer by at least a couple of hours that way for me.

My thinking is that the small electronics in the battery and the elctronics in the phone talk to each other during charging and they for safety will not overcharge the battery or overtax the charging system of the phone. Where as an external charger isn't talking to anything at all and will continue to charge to full capacity and possibly further which is I am sure harmful to the batteries if just left in for 4months or so as I can atest to this on external chargers on all my PalmOS product (my extended Seidio batteries developed a pregnant bulge when I left them in like that), which by the way had the same symptoms of dropping battery percentage after unplugging from in phone charger.

Bottom line, if you don't want to see your battery percentage drop after unplugging, quit fooling around with this time consuming bump charge dance and simply buy an external charger and you will have 100% for at least 30 to 45min depending on light use before dropping from 100% - example of light use for me was checking a few emails, doing a couple of text messages, and running Smartbench 2010 - my 100% freshly install battery lasted 32 minutes before it dropped to 98%

Note: I do not use any battery saving apps - I do not turn off wifi or gps, I have sync always on and any other sync they requires you input a time in between syncs I have set to 1 hour and I get at least 18 to 24 hours of use in the way I use my phone - so it will be hard to tell how much time you get per charge because we all use our phone differently.

External AC chargers are the BEST! :D