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The old best charger in the world is dead...

This new BIGGER Hyperion EOS1420i-NET3 charger has all the same huge feature set and a full 550 watt output!

How to convert the Hyperion 1420i Charger to wirelessly connect to your PC via Bluetooth!

This charger is sold mainly to model aircraft and hobby enthusiasts. I know, because I am one!

However its capability for charging and testing ALL battery types including the ones we use in powerchairs is simply stunning!  And will charge and balance tomorrows lithium batteries that we WILL be using too. Up to 14 cells or 60 volts...

It can happily charge any type or size of battery currently available at up to 20 amps.  It makes every other battery charger on the market obsolete. And now it can charge a pair of wheelchair batteries at a full 20 amps! With a better safer algorithm than existing "cheap" plug and play mobility chargers.

So wheelchair and scooter batteries of up to 100Ah or so are no problem at all.  Both at home or in a car. The fact that you can choose all the individual charge / discharge parameters to suit your particular batteries, and to watch it charge on your PC screen, with every possible bit of information available at your fingertips helps too and fascinates me!   It means you can see the batteries deteriorate over time, see how charged up they are visually, capacity test them and watch them charge in great detail. 

It can also charge your powerchair fast from your cars 12v supply as you drive!   <<< Read that again!

If you OWN this charger already, please get the latest Firmware and the latest PC Software as soon as possible as MUCH improvement and development has taken place recently that I have been helping to develop regarding the Lead Acid (Gel and AGM) based battery charging algorithms. Its now absolutely superb. And flexible!  And there is now a public beta software page here and Hyperion's page here.

If you are using earlier firmware than version 5.0 on any Hyperion charger then your lead acid batteries are not being charged correctly!  

More interesting powerchair charging methods

I use it to charge everything from my vehicles own batteries to my powerchairs and all my hobby stuff (aircraft, helicopters etc) as well as camera and other small lithium and Nickel Metal Hydride / NiCad batteries.

One of the clever parts is that it runs from either a 12v or a 24v battery power supply or with a suitable wall powered supply.  (Available from any hobby store or eBay) Power supplies to do this are bought separately. They are not expensive. And it makes the charger itself very light and portable for external mobile use.

Useful because it runs from any 12v wheelchair or automotive battery as well. So you can take it out with you as you use your powerchair. Charge from any car. Or from a PAIR of batteries, at 24v, just like out powerchairs and scooters or many RVs, trucks and buses... 

You will need a power/charge Anderson connector fitting to your powerchair or scooter.  And another fitted to your vehicles battery ideally to make this easy to do.

So that means I can use it to charge either a wheelchair or scooter whilst I drive, or while out and about from other vehicles - or - It also means that if your cars battery goes flat (say you left the lights on at the cinema or whatever) you are not left stranded as you can now rapidly charge your cars battery directly from your powerchair as well! 

As a wheelchair user you don't need me to tell you how useful that might be.

Works both ways. 12v to 12v, 12v to 24v, 24v to 12v etc... What's more its very configurable, in that you can tell it how many (maximum) amps to take from your source battery / supply and also set the charge rates and voltage separately too.

And you can charge everything else you own - better than the cheap chargers all these items come with - from your camera to your laptop batteries, or anything else that's rechargeable!  And you can do it on the move from wheelchair or vehicle.


And you can graph a batteries performance to monitor its condition over time. And its a much better charger with peak detect / float / trickle settings (adjustable) and many other advanced charge and discharge features tailored to every individual battery type.

You can control the power it draws from wherever you plugged it in. So a maximum of say 8 amps if you are connecting to a cigarette lighter socket in a car is sensible for e.g. More may melt it! Or the charge socket on a powerchair or scooter. (Once you fit the Anderson connectors there is no limits though). All of this requires some knowledge of basic electrics and batteries of course, and a few leads and cables making up.  But its all incredibly useful for those that want and need the flexibility.

In addition it can charge your Lithium Polymer battery packs (of up to 14 cells at up to 20 amps) and balance the individual cells accurately during charge.  And lithium Ion, as well as Lithium Ion Phosphate (A123 cells).  And large numbers of Nickel Cadmium, and Nickel Metal Hydride at one time. Or one cell at once.

But the most USEFUL thing it does is connect to a PC and allow you to Graph each and every one of your batteries in your powerchair (or ANY battery) as the charger "discharges" it!. So I know when to order a new mobile phone battery, as well as monitoring my powerchairs batteries over time.

You choose the discharge rate to coincide with the batteries rated (20 hour rate?) capacity. So a 70Ah wheelchair battery should be able to deliver 3.5 amps for 20 hours as an example. You set this in the charger and it automatically discharges the battery at a fixed current to a safe level (you choose) down to a preset voltage limit and graphs the results. 

This allows you to clearly SEE its performance, its exact capacity in Ah or Amp Hours, (or m/Ah hours) as well as displaying its internal resistance in m/Ohms.

This means that after a few months you can run the test again and display a new graph to see EXACTLY how much your batteries have deteriorated. In huge detail.

And you can save all these records/graphs for later use on your PC.

If you have many batteries as I do then it helps to label each one with a new date and a number so you don't get confused!  And give the file the same number. 

It will help you decide the best time to replace you batteries.

You can see how much capacity they still have, and more importantly you can see if the internal resistance has increased which is another big issue with powerchair batteries. (or any batteries) An example graph is below. 

It will also tell you exact amp hours provided to a few decimal places from fully charged down to your chosen cut off voltage as it DISCHARGES your battery. And again as it charges your battery (or string of batteries)

And an average internal resistance figure over a charge/discharge cycle. That increases as the battery becomes more discharged. The figures given here are for fully charged batteries.

Discharge graph. for a 55Ah Optima AGM Lead based wheelchair battery beginning!  I chose 5.5 Amps discharge rate so it should take 10 hours to discharge a fully charged 55Ah battery - that will tell me its capacity at the 10 hour rate. To 2 decimal places! And will also tell me its internal resistance. So I can see if its still worth keeping!  Its not looking good.


This charger is worth at least twice its purchase price if not much more!

What can it do? Its easier to say what it can't do.

If you own a battery powered device of ANY kind, from model and hobby stuff, to golf carts and powered wheelchairs, lawnmowers, and you understand batteries you really do want this charger!

because its the most flexible and capable device available.


Quick and simplified summary:

It can charge every battery you own. Or are likely to own in the future! And it
can graph and evaluate them as they age and give a true picture of condition.

If you own a powered wheelchair as I do the fact that it can test and evaluate
and graph your batteries better than many multi thousand pound "battery testers" as used by the industry is reason alone to buy one.

Plus it can charge your 24v powerchair (or ANY other device) either at home or in your car from its 12v supply, efficiently and in controlled fashion at least as well as any dedicated simple wheelchair charger can. For less money.

But it can charge ALL battery types and sizes. From your phone, to your boat. It can charge anything at up to 250 watts or a
maximum of 20 amps.

It can run from either 12v or from 24v input power. (up to 30v) Or any
figure in between. So your car, or a bench power supply at home.

1. Lead Acid / gel, AGM deep cycle, car starter etc 2v, up to 24v:

It can charge Lead Acid / Gel / AGM batteries from tiny right up to  to fork lift truck sized... And can do so with a multi adjustable 3 stage CC/CV/Float algo.

Whets more it can graph, and measure the output capacity and internal resistance. This alone makes it worth its weight in gold as it allows you to accurately evaluate your batteries on a computer screen and save the info as
they age...

If you use deep cycle batteries in say a scooter, golf cart or wheelchair this is important! And it lets you charge a 24v mobility or other device from your 12v car. Or in fact the other way around! It can charge a 24v wheelchair at at
10 amps. Or a single 12v battery at 20 amps! Or less, you choose battery charge Voltage, float Voltage and Amps.

so while it is extremely flexible, it requires you to know what you are doing to take full advantage! For mobility batteries I bought two of these. One is at home connected to the PC so I can monitor battery condition and watch it charge in detail every night. The other is in my van for charging my powerchair while I am out and about! Small light efficient. It can charge any 2v, 6v, 8v, 12v, 24v battery systems of all lead based battery types. From very small Up to around 250Ah.


2. Lithium Ion

It can charge up to 14 Lithium Ion cells in series, Discharge them, and balance them and shows you the results on the computer screen for each individual cell. Its actually pretty essential. I can test, graph and charge everything from mobile phone batteries to my Nikon camera battery and get a real picture of its condition. And I can test cheap copy Chinese batteries and compare them. As it happens they seem just as good. Again there are terminal voltage adjustments,
storage settings, and charge amps amount settings. Again up to 20 amps or 250 watts - whichever comes first. In the future lithium batteries will be used in mobility devices so the balance and evaluation capability will be future proof and essential as it allows 24v lithium based batteries to be used.

3. Lithium ion Phosphate (A123 Cells etc) LiFe Cells

It can charge up to 14 Lithium ion Phosphate cells in series, Discharge them, and balance them and shows you the results on the computer screen for each individual cell. I can test, graph and charge, and balance the cells and graph the results for cells individually. Again there are terminal voltage adjustments, storage settings, and charge amps amount settings. Again up to 20 amps or 250 watts - whichever comes first. Again In the future lithium ion Phosphate batteries will be used in mobility devices so the balance and evaluation capability of 7 cells will be future proof and essential as it
allows 24v lithium based batteries to be used.


4. Lithium polymer (LiPo)

It can charge up to 14 Lithium polymer (LiPo) cells in series, Discharge them, and balance them and shows you the results on the computer screen for each individual cell. I can test, graph and charge, and balance the cells and graph
the results for cells individually. Again there are terminal voltage adjustments, storage settings, and charge amps amount settings. Again up to 20 amps or 250 watts - whichever comes first. I use 6 cell LiPo batteries in my helicopter and it charges these at 10 amps+ (5C) easily and quickly! CC/CV/Balance method with fine user adjustable terminal voltage. And again these may get used as 7 cell strings to replace 24 volt lead based batteries in
scooters, electric bikes etc. The 7 cell capability for balance and charge is for the future for sure.

Nickel Cadmium and Nickel Metal Hydride
It charges anything from a tiny single cell (like an AAA or smaller) up to rather a lot of them in series! It uses the peak detect, and temperature method. You choose. And you choose the charge rate, the trickle charge rate and the peak detect settings should you wish. And of course you can do everything from your PC including driving the charger, graphing the discharge and charge results etc.

I cannot think of any battery of any size that this thing cannot test or charge!

If anything comes out that cannot be charged then Hyperion are very on the ball with firmware and software updates regularly released! Every battery shop, car dealer, wheelchair user, hobbyist that UNDERSTANDS batteries NEEDS one of these!  No I don't actually sell them And am not affiliated in any way other than receiving a free charger for helping with the lead acid development. And I bought this one and the one in my van...

More screenshots

12v wheelchair Battery about 60 percent discharged under test  Will stop automatically at 1.8v per cell and give me actual measured capacity and internal resistance figures to 2 decimal places.

Discharging a 3 cell LiPo battery...

Recharging the same battery - and balancing all cells at the same time.

Note the cell readings - all are within 1000th of a volt!  They should be 4.200 volts per cell. This is actually adjustable with this charger too. But these cells can be dangerous, so adjust this at your peril!

Hyperion EOS0720I NET3 CHARGER

I have a lead or connector to fit everything here! Currently charging a tiny PP3 9v rechargeable battery for my multi meter!

I charge everything from single AAA batteries (All types) to huge packs of them at once. And mobile phone batteries right up to big wheelchair Lead Acid batteries with this one charger! IT DOES EVERYTHING. Including the fancy Lithium Polymer ones in my helicopter.

And I charge from battery to battery, or from a power supply. And I graph and measure the various batteries performance in all cases on my PC so can see the extent of any deterioration. 

At home you will need a power supply. To make full use of this chargers power you need a 24v power supply. Of 20 amps or above. If you use a 12v supply you will be limited to about the same power output as the older charger the 720i on this page here. So trot over to eBay and buy a cheap 20 amp 24v industrial power supply! These come from china and are used in all manner of things. The one below is OK but only has a 12 to 15v output. So will restrict the full power output of the new EOS1420i Net3 Charger...  

This power supply is too low voltage for full power.



--- 12.00v system   (24.00v) system ---

MK GEL batteries and Sonnenschein Gel as used in MOST wheelchairs:
Probably ok for other true GEL batteries too.


  • Slow overnight (regular cyclic daily use):
    Float Charge: 13.80v  (27.60v)
    Charge: 14.10v (28.20v) @ FULL POWER - Disconnect in the morning when you need the chair - see below.


  • Fast charge:
    Float Off, Charge 14.40V (28.80v) @ Maximum Amps (Choose 20 Amps). Typically used during the day as time allows for a top up. Charge completion is not essential (or desirable as the last few percent takes hours!) but overnight charging as above is still essential if you do this!  Opportunistic charging will LENGTHEN the service life of your batteries due to lower average discharge levels contrary to what some less knowledgeable people may tell you.


  • Long term storage or occasional use
    Float: 13.5v (27Vv) - leave connected and on permanently after charge ends!
    Charge: 14.10v  (28.20v) @ 3 or 4 Amps

    This will ensure batteries last as long as possible. This setting uses a lower float voltage than cyclic charging requires. If you ever use or move the chair restart the charger from the beginning of the charge cycle.

    MKs Own Gel Battery charging specification PDF file here!  Which says the same thing. but in a more complex way...


AGM -- Typical GOOD AGM batteries like Odyssey and Optima as used in some wheelchairs by those that understand the REAL benefits of such good batteries and for vehicles etc:

  • Overnight (regular Cyclic use):
    Float: 13.6v  (27.2v)
    Charge: 14.7v (29.4) @ *typically 18 Amps - Disconnect in the morning when you need the chair.


  • Fast charge: Charge completion is not essential here but overnight charging as above is if you choose to do this!
    Float: Off 
    Charge 14.70v (29.40v) @ Maximum Amps (Choose 20 Amps charger will charge at its max watts rating). Typically only  used during the day or in a vehicle as time allows or as is required.
    Opportunistic charging will LENGTHEN the service life of your batteries due to lower average discharge levels if you do this as often as possible.


  • Long term storage or occasional use
    Float: 13.26v  (26.52) - leave connected and on permanently after charge ends for  long term battery protection!
    Charge: 14.52v (29.04v) @ MAX Amps

    This will ensure batteries last as long as possible. If you ever use or move the chair restart the charger from the beginning of the charge cycle.


To find out WHY these are the best settings for THESE batteries and our usage join the forum below and ask!  

Message Board

For other batteries, please see specific manufacturers data. Although these figures for GEL and AGM will probably be much closer than any charger you are currently using as supplied with your powerchair. These mostly are underpowered and charge at 14.4v to try and get a complete charge in a short time with issues regarding gel batteries.


Make sure you have the very LATEST firmware for your charger!

In any case version 4.6 or better as your charger will not charge lead based batteries correctly otherwise. Ideally version 4.9 out very soon - as of 11 - 7 - 10 Watch carefully!

This version has many refinements we need for powerchair batteries

First of all, the manual can be found here;

Visit the EOS CHARGER Firmware Update site for the newest version:

Finally, the LATEST Control & Data Suite program updated very often, can be found here;

This program has a requirement of .NET Framework 3.5
If your computer is not updated this component need to be updated from Microsoft.

Note: If you have trouble with SiLabs driver for the chargers, the latest version can be found here;


Related Pages

Lithium Ion Batteries for Powerchairs and Scooters  |  AA Battery testing! Which Rechargeable AA is best?

Charge a Powerchair directly from a vehicle. via the same Anderson connectors

Anderson Style connectors and why you need them

Fast Charge YOUR Powerchair in Around 1 Hour

Inverters & Chargers

Batteries for Both Vans & Power Wheelchairs

Which Batteries to Buy

Very Flexible Charger!


Lithium Ion Batteries for Powerchairs and Scooters

My Power Wheelchair or Scooter Will Not Charge

BCI Battery Sizes, Group 22, 24, 34, 27 etc

Drive Your Powerchair by Radio Control

A Superior Powerchair overnight charger

Battery Planning How to organise yourself for every eventuality!


MORE: Detailed PowerChair Only Menu




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Battery set up screen

A few batteries I charge. Not included here: My 4 power wheelchairs, my helicopter, numerous keyboards,

Various mice, strimmer, Garden lights, 2 RC transmitters, doorbell(!) and TV remotes, smart phones, model plane batteries,

and the unseen batteries inside the box the jet engine is bolted onto! + More...



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