replace chuwi HI8 battery to larger one.

[Derek]

You should just be able order any random lipo battery that is 3.7v and has a discharge controller

I took my tablet apart today to get the dimensions of the battery because im thinking of doing the same thing.

154mm x 65mm x 3mm
The battery is stuck on to the back of the screen pretty well so you will need something thin to separate it from the glue.
You will need to unsolder the old battery from the board and resolder the new battery.

A battery like this should work but this isnt an upgrade because it is 400 mAh less than the current battery in the HI8
http://www.banggood.com/3600mAh-3_7V-Rechargeable-Lithium-Battery-For-Tablet-p-942765.html

And here is a teardown video to show you what it looks like on the inside (not my video)

[Chris G]

Oh that’s my video. No room in this tablet for larger batteries. Sorry!

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[Derek]

Chris G wrote:

Oh that’s my video. No room in this tablet for larger batteries. Sorry!

Not with that attitude.

[fager]

I also thought about a battery mod.

Instead of searching for a battery with the same dimensions, I was wondering if it would be possible to install a second one with the same size and connect them in series.

Currently my Hi8 is placed in this case

http://www.banggood.com/Tri-fold-Stand-PU-Leather-Case-Cover-for-Chuwi-Hi8-Tablet-p-987129.html

Given the hight of the installed battery, 3mm, I think it could fit in the case. Removing the backcover of the tablet + cutting out some plastics within the case should provide enough space.

The lack of electrical engeneering know-how prevented me from realization.

[Guy Dviri]

Thanks , if any fit battery with  larger capacity battery will be available please post in this thread.

[CardinalFang]

i’m also interested

[Carles]

Hello all,

After a little bit of research I found that batteries have to be in paralel and not in series.

in series will increase the voltage but not the capacity, and in paralel will incrase capacity but with the same voltage. (images attached or visit : http://www.zbattery.com/Connecting-Batteries-in-Series-or-Parallel)

The question is : Could we combine two or more 3,7v batteries go further than the original 4000mah?

Could someone confirm that the chuwi hi8 battery has only positive and negative leads instead of teclast x98 that got three?

 

Carles.

 

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[Carles]

please post original chuwi hi8 battery measurements to calculate the space.

Thank you.

[Carles]

Hello again,

I didn’t notice that measurements were in this same post sorry.

After researching about combining batteries I have found some videos and reviews that claim its possible to double the capacity connecting them in paralel but they has to be the same model and coming from the same manufacturer, having the same charge and state of charge

 

• Note 1 : Connecting two identical batteries in parallel will often increase the lifetime by a factor of at least two, and may increase the lifetime by even more than that (not only will the batteries be drawn down about half as fast as would be a single battery, but they may allow a device to keep working past the level of depletion that would cause a device to fail if only using a single battery). There is, however, an important caveat: if one battery is stronger than the other, it’s possible that the stronger battery may try to push power into the weaker one. If the batteries are not rechargeable, such action may be detrimental to both batteries; even if the batteries are rechargeable, they may be damaged if they are connected while the difference in charge is too great.

 

• Note 2 : all the batteries should be from the same manufacturing lot and exposed to identical conditions, and should thus generally have very similar states of charge

 

• Note 3 : If the device is an off-the-shelf product, and you have no way of knowing what’s inside, connecting extra cells in parallel is an option that’s safe on the circuitry inside the box, as it will keep the voltage range of the battery the same. For 2x battery life, wire 2 in parallel, for 3x battery life, 3 in parallel. Not 3p2s or 2p3s etc. as adding any in serial will increase the battery pack voltage, which the device’s circuitry may not be able to handle. However you should note that connecting cells in parallel is not without danger to the battery itself. If the cells are not well matched, like if they are different capacity (size), age, state of charge, temperature, and so on, you can get a large current going from one cell to the other when you first connect them, until they equalize in voltage. This current can be high enough to do permanent damage to the cells. Additionally there is the problem of slightly mismatched capacities, where at the end of a discharge cycle one of the cells will be empty before the other one, so the one with a little energy remaining will provide all the current. The same thing happens at the end of charging, where one gets full earlier and the other is being charged at twice the nominal rate. Unless you take the trouble to put a current meter on each cell, it’s an invisible problem, but over many charge/discharge cycles it can do serious damage to the overworked cell, potentially even fire or explosion. When Sanyo recalled some lithium-ion batteries from Lenovo, it was the 3s3p extended packs that were the problem, the same cells in 3s2p were ok. The more cells in parallel, the worse the imbalance problem gets, which is why you generally don’t see >3p in commercial products. The battery probably won’t catch fire the first time you use it, but statistically over lots of shipped product there can be a higher failure rate. For a hobby project, you can mitigate this by using new cells (not salvage from different old laptop packs) and adding a resistor between the parallel cells as a current limiter at least until they equalize. All of the above only applies to lithium-ion. If you’re using NiMH or NiCd, you probably don’t want to connect them in parallel at all. Lithium-ion is easy to charge because you just connect it to a power supply that is both current- and voltage-limited, and turn off the charger when the current falls below some threshold or you get past a timeout (or a safety flag such as temperature). NiCd/NiMH is a lot messier to charge (quickly), you need a circuit that can watch the voltage profile, temperature, etc. (unless you’re trickle charging). The imbalance problem would be more difficult. It’s probably been done, but when laptops ran from NiCd the packs had a higher voltage because the cells were all in series. Disposable alkalines are always in series because you can expect the user to pick any old cells from the drawer without regard for state of charge. They can already leak if overdischarged, connecting them in parallel would only make the problem worse. Imagine someone mixing NiMH and alkaline AA of various capacity and fullness randomly in both series and parallel – the product will soon be ruined. For a hobby project, nobody’s going to care if you ruin a few Energizers, but for anything you’ll hand to someone else you should be more careful. There are other ways to improve your battery life besides connecting extra cells in parallel. Probably the easiest way is simply to use larger cells. For alkaline or NiMH/NiCd, switching from AAA to AA will more than double battery life, and for even more capacity you can use C or D cells. For lithium polymer, there are lots of sizes to choose from, including custom if you need it. If you’re using disposable AA or AAA cells you can double battery life by switching from alkaline to Energizer lithium. They cost more than double, so they’re more expensive in $/Wh, but they also weigh half as much and they still fit inside the device.

( extracted from : http://electronics.stackexchange.com/questions/2675/how-do-i-connect-two-identical-batteries-to-increase-the-consumer-lifetime )

 

Ok knowing that, maybe connecting 2 same batteries(one over each other) in paralel from the derek post  for example ( http://www.banggood.com/3600mAh-3_7V-Rechargeable-Lithium-Battery-For-Tablet-p-942765.html ) could do the trick. (7200mah?)

Then the rear case should be modified. Maybe aplying hot air with a blow air gun to push the rear case to get a depth of 4mm more?? Or a 3d printed one?

This is only a informative post IM NOT RESPONSIBLE OF ANY INJURIES CAUSED BY UNEXPERIENCED USERS OR DAMAGE CAUSED TO YOUR TABLET, DO IT AS YOUR OWN RISK. this could be dangerous, dont try it if you are not sure how to do it.

[Tony]

It’s not worth it. If it requires you to modify the rear case, then might as well just buy an external battery/power bank. They’re very cheap: http://www.amazon.com/s/ref=nb_sb_noss_2?url=search-alias%3Daps&field-keywords=thin+power+bank

[nghienvt]

http://www.aliexpress.com/item/Inner-Exchange-Battery-5000mAh-for-8-Chuwi-Hi8-windows-Tablet-3263156-Batteries-Cell-Replacement-free-shipping/32581570306.html?ws_ab_test=searchweb201556_6,searchweb201602_3_505_506_503_504_10034_10020_502_10001_10014_10002_10017_10005_10010_10006_10011_10003_10021_10004_10022_10009_10008_2030000_10018_10019,searchweb201603_1&btsid=9b446474-fee1-44ec-838f-ea3936d4e112

I found this battery, can someone test it and post a result? 😉

[BliNDF123]

nghienvt wrote:

http://www.aliexpress.com/item/Inner-Exchange-Battery-5000mAh-for-8-Chuwi-Hi8-windows-Tablet-3263156-Batteries-Cell-Replacement-free-shipping/32581570306.html?ws_ab_test=searchweb201556_6,searchweb201602_3_505_506_503_504_10034_10020_502_10001_10014_10002_10017_10005_10010_10006_10011_10003_10021_10004_10022_10009_10008_2030000_10018_10019,searchweb201603_1&btsid=9b446474-fee1-44ec-838f-ea3936d4e112 I found this battery, can someone test it and post a result? ?

I just received this battery, it’s working great but the chip on it looks cheap compared to the stock one.  I don’t know what all the little components on the small board the battery has attached are but this replacement doesn’t seem to have much of anything.  But it actually works, unlike the stock one, so I guess it doesn’t matter much.  My Chuwi Hi8 I received at the end of January kept turning off at 50-60%, I was lucky to even get 45 minutes before it turned off.  This replacement came around 60% charged and just to test it I ran Spotify on it with the same charge it came with and I got around 4 hours 15 minutes before I connected it at around 6%.  I didn’t measure the old battery but this replacement is a bit shorter.

Now one BIG problem with the seller is the complete lack of communication, I ordered the battery February 4th and received it yesterday April 4th.  The seller didn’t respond to any of my 3 messages between February and most of March until I started a dispute March 29th for a refund.  The seller literally responded the next day once I started the dispute and refused to give me the refund and gave me a link to the “tracking” number, which turned out to be an order number on this website (I linked it below), and there you can see the actual tracking number.  I messaged him again afterwards and again no response, but with the actual tracking I could see that it was actually sent and moving and received it soon after.

http://directlinktrackedplus.com/multipletrack-client2.php?lang=en&postal_ref_mode=0

So it could be a 2 month wait if you’ve got the patience, and with the link above you can get the real tracking with his “tracking” (order) number.

To remove the old battery I used an old credit card.  The battery has 2 pieces of really tough double sided tape going long ways on the battery.  Just have to wiggle the credit card under it a little at a time.

[Author]

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