Lithium Batteries

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One of the difficult parts when prototyping  a new project is to find reliable power sources that don’t cost you too much. Here I’ll show how to refurbish dead battery packs by stripping them down, testing each cell and combining cells to produce a new pack.

I’ve been pretty luck with some of my recent finds, an old electric cycle lithium pack, they seemed only to have a faulty connector to almost dead Apple MacBook Pro batteries, so I decided to tear them down to see if there was something profitable.

Here is a look at them

Electric bicycle lithium battery pack
Electric bicycle lithium battery pack

Apple MacBook Pro batteries – Cell Part Numbers US604496
Apple MacBook Pro batteries – Cell Part Numbers US604496


So next step is pull the packs apart and get each individual cell out, i know this is a pain, particularly when they may already be made int eh size you want, but time spent here will save a lot headaches and pain later.

13A23 lithium cell on charge


so above we have a cell on charge, this is from the bicycle pack, didn’t find any information on google about this one but by calculation should be 4.25 amp, so a pretty good size. note start of slow, so i set the charger to 500 mA and checked regularly  while it was on my desk to make sure it was not getting warm, if it does start to get warm its a good sign that cell is dead, chuck it. equally if after charging and left unused for a few days you check the cell and find its dropped voltage say over 0.2 Volts, its a cell thats probably going to go bad, chuck it.

Go through all the cells you have, charge them and make notes of their voltages and when you come to make up your battery pack, check the cells have not lost voltage, only use the best ones you find, this is the same for the famous 18650 cells that are used in laptop batteries.

I would also recommend however tempting they seem dont get fooled into buying lithium cells from china or anyone that claims supper high capacity cells and really cheap prices, you will only get disappointed when you find out in fact they only hold a few hundred mA at best.

so why do i want these cells, what am I planing with them, I will show you all soon but for now a quick gimps (ignor the lead acid batteries on it, there just for testing as i had them to hand), enjoy – keep safe

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2 thoughts on “Lithium Batteries”

  1. Electric bike sales are seeing a sharp rise across Europe according to the latest reports from the European Cyclists’ Federation (ECF), which predicts a 55 increase over a nine year period. Their increase in popularity should be no surprise, with e-bikes getting lighter, more powerful, more economical and, most importantly for consumers, cheaper. With many European cities putting a fresh focus on cycling to reduce congestion and pollution levels, their citizens are looking to take advantage of the improved cycling routes with alternatives to traditional bicycles. Additionally, as cities expand outwards, commuting times have become longer and more costly. With daily commuters keen to avoid the rising cost of public transport and overcrowding, pedal bikes make cycling to work unrealistic. However, with new and improved electric bikes, using a bicycle for daily commenting, city roaming, and even country travel, is now an attractive possibility for many. Three good examples of countries that are seeing an increase in e-bike usage are the Netherlands, Spain and the United Kingdom. The Dutch have always been one of the leading bike friendly countries in Europe, with Amsterdam having the second highest number of citizens who regularly cycle. With that many people dependent on their bike, many expected electric bicycle adoption rate to be slow in the Netherlands. However, worries that the Dutch would be unwilling to cast aside their tried and tested peddle power bikes, ebike sales saw a huge 24 increase from 2014 to 2015, with a total of 276,000 units sold in a twelve month period. Most interestingly was sales seen in Spain and the UK. Both the British and Spanish are known to shy away from travelling by bike, with the two countries being 13th and 14th respectively in electric bike unit sales. Despite these relatively low adoption rates, Spain saw e-bike sales increase by 40 between 2014 and 2015, mainly thanks to the government’s new investments in cycling routes. Similarly in the UK, while yearly unit sale increases are slow, the government are keen to get more people on two wheels. At the start of 2017, they announced a £64 million fund aimed to encourage more people to cycle. In addition, new technologies are emerging that helps cities plan cycle routes more easily. Open source web tool, Propensity to Cycle Tool (PCT), allows urban planners to visualize and estimate cycling demand. With its e-bike feature, it can take into account that commuters would be willing to travel further by bike and be able to tackle steeper slopes – greatly expanding the number cycling routes which could be added to current and future infrastructure. Currently the tool is only available for major English cities, including London, Liverpool and Manchester, but the developers hope to roll it out to all larger cities across Europe in the future. With more and more people looking for alternatives to public transport, as well as wanting to avoid polluting petrol and diesel vehicles, and with governments continued investment in biking infrastructure, the demand for electric bikes is only going to continue to rise. You Can Get Some Good Electic Bike On Sale Here

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