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Let's go one step further in our model of DIY extender. We have already seen that we can connect two "same" battery banks in parallel as long as both banks have the same charge. How charge and voltage are related according to the cell manufacturer's curves. So we can say "equal volages = equal...

Here are some illustrations of a laboratory scale test. I have used 2 banks 1S 2P of 2550 Ah. They were separately charged to a certain level and the individual voltages were Bank A = 8.14v, Bank B = 8.13v connecting both banks in parallel produced a current from A to B of 1.39 mA. Just as...

As I've mentioned, and this is a very personal conclusion I've come to, the Mahle Battery Extender was designed to function similar to a battery charger with current limiting at 2 amps. Why so? Because it is the safest and easiest way to use by anyone, at any time and without having to take any...

Allow me to make an explanatory summary about the Mahle extender system and the options we have when building a DIY extender. These conclusions that I will summarize are the result of my careful analysis of the Mahle and Orbea specifications on their battery extender. As a professional I start...

Battery Extender Continuing with the experiences and learning of the Orbea Gain D50, I have come to the conclusion that it will not be bad to have a battery extension system. We have optimized the administration of the energy available in the main battery to the maximum, we have gotten...

The first basic measurement we will make in the actual DIY extender and main batt bank will be to charge separately up to 100% (when the charging current is < 20 mA the ammeter used will mark o mA) both batteries. After completing these charges up to 100% on both batteries we will take note of...

Here we can see the adaptations and connectorization for the DIY extender. M2 is an adapter to charge the DIY extender batt with the same Mahle charger that we use for the main batt. This is optional.

The following image shows a cheap and useful instrument to which I have put a connector compatible with the ones we will use in the DIY extender. We can measure voltage and current simultaneously.

Next I will show a series of images about the construction process of the DIY extender. A series of manual modification work was necessary but nothing that cannot be achieved with patience and care.

What you write down is correct. I would say that it is not the expected result. But it is real for that test fix. The only explanation I have is that these banks are not new and have too many charge and discharge cycles. We will leave this test phase until there and we will go on to tests with...

Support information on internal resitance. https://lygte-info.dk/review/batteries2012/Sanyo%20NCR18650GA%203500mAh%20%28Red%29%20UK.html

Let's go one step further in our model of DIY extender. We have already seen that we can connect two "same" battery banks in parallel as long as both banks have the same charge. How charge and voltage are related according to the cell manufacturer's curves. So we can say "equal volages = equal...

Even if you have measured on other bikes, we can learn the way you did.

Great! Just let us know your measurement results. It will be very valuable for this forum.

I'd be interested to know if there's been a reliable demonstration of more than 2amps being supplied to the system through the charging port. A direct current measurement is a bit tricky to do, but using voltage measurements you can come to same conclusions. It is for this reason that Yako's...

Here are some illustrations of a laboratory scale test. I have used 2 banks 1S 2P of 2550 Ah. They were separately charged to a certain level and the individual voltages were Bank A = 8.14v, Bank B = 8.13v connecting both banks in parallel produced a current from A to B of 1.39 mA. Just as...

As I've mentioned, and this is a very personal conclusion I've come to, the Mahle Battery Extender was designed to function similar to a battery charger with current limiting at 2 amps. Why so? Because it is the safest and easiest way to use by anyone, at any time and without having to take any...

It will depend on the discharge rate of the main batt. I don not like the idea of stop my ride and wait until main batt get some charge.

I think I understand. Are you suggesting that the bike's charging system relies on the official accessories (mains charger and range extender) to limit and modulate their output below 2a? and by extension, making more amps available would risk charging the bike battery at a rate higher than 1C...

Another test that occurred to me could be to get your bike down to say 25% or so and then connect your range extender. Leave it connected for 15 minutes perhaps, and see what the SOC is. I do not recommend to do that with a DIY extender.