The battery's gone wonky on my tablet. It takes a 3000 mah. If I was able to get a battery, like maybe, a 6000 mah, would it charge correctly, or would I need to go back with the same type battery?
There is plenty of room for a larger size battery, longer, wider, and even thicker. It would be easy enough to measure, I just forgot to when I had the case open.
Is there a web site where I could get a new battery?
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Just guessing - but its probably not unlike a laptop battery, in which case almost certainly lithium.
Do not mess with lithium cells unless you know what you're doing!
Particularly multiple cells. They require a charge balancing system - if any one cell gets over charged, it can go exothermic with a fairly entertaining end of life performance.
That could be interesting.
The battery is flat, appx 5mm thick, 60 mm wide & 80 mm long.
I might open it again soon & get exact measurements. It would be easy to replace, if I knew where to get a battery.
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If its an actual flat cell in a heavy duty PVC pouch - they just flame - the steel cased cylindrical type have safety vents, but I'm guessing these get clogged with debris as the electrodes disintegrate. A youtube clip shows someone deliberately shorting a cylindrical cell - several long boring minutes of fizzing rather tamely culminated in the cell going off like a firecracker. There was a small shower of sparks that could easily be a fire risk, the steel case ruptured so if you're holding it you'd get lacerations, the caustic burns would be a serious complication to healing.
There's a place in China that will sell me 1000 batteries, but not one by it's self.
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I just checked EBAY and they have some there.
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Yesterday I scored a pack of 6x 18650 from the recycling bin at the supermarket.
The previous haul was marked "Made in China" and had no laptop brand printed on it - my main requirement is for e-cigarette batteries, I might designate the Chinese cells for an application I don't hold near my face when I press the button!
Chinese make cheap crap. Last night I tried to unplug a Chinese made adapter from the wall, it fell apart and I was almost electrocuted with 110 volts.
Some day I'm going to take time to look around trash bins at the supermarket. I've heard good things can be found.
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Some laptop batteries are intelligent and won't charge unless conditions are met, won't overcharge, etc.
It may not be possible just to put any battery into a tablet, I dunno.
Oh well.. The battery I ordered was inexpensive enough it won't matter, and I'm ready to buy a new tablet, if it doesn't work.
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Most of the cells I've rescued for my E-cigarette seem to work just fine.
IMO; the 'intelligent' bit may often be a bit over zeallous.
We have an old Mac laptop with a missing charger.
I thought maybe I could remove the battery and charge it directly. There is not just + and GND on that battery, there are a lot of terminals and apparently a processor.
Multiple cell packs have sophisticated charge balancing circuitry - not all cells are created equal, and the one that gets overcharged first goes exothermic with fairly entertaining results.
You'd probably have to charge each cell individually - you could salvage the end of charge shut off capsule from an e-cig and use a USB charger.
AFAICR: Most laptop chargers are 19V - you just need the right power jack with the right centre pin polarity.
In the UK; I bought a universal laptop brick from Maplin (rip-off!) it has a switch to select several voltages, and a rubber strip with an assortment of changeable power jacks pressed into it.
Even at Maplin rip-off prices, it was probably a lot cheaper than most genuine replacements.
Yeah, the battery and charge circuitry is smart, which means it's a mess to tamper with. The 'missing charger', on the other hand, is just a voltage source, you can get replacements cheap, compared to a battery replacement price.
There are only two wires on this tablet battery. When the solder broke where the charger plugs in, before I soldered it, I charged the battery directly, which might have been what caused the battery to go wonky, although it never worked really great from the beginning.
I always had to let the battery get down below 20% before plugging in the charger, to keep it working good, and if I unplugged it before it was fully charged it started having problems.
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How old is this thing? "Memory" issues on rechargeable batteries, to whatever extent they existed, were solved decades ago.
There's a specific end point voltage per cell that you shouldn't discharge below, overcharging can also shorten cell life (sometimes very abruptly!).
AFAIK: there is no memory effect associated with any lithium cells.
Apparently some manufacturers make chips with a constant power charging mode - over discharged cells need to be coaxed up gently to a normal state before piling on the normal charge rate.
I bought it three years ago.
Except for the battery problems I've been happy with it.
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