Detailed Full PowerChair Related ONLY Menu HERE
Detailed Wheelchair Accessible Vehicles ONLY menu HERE
Detailed Menu of Everything else HERE!
VW Caravelle VR6
BUILT ULTIMATE POWERCHAIRS:
2 | 3
My VERY Modified Off Road & All terrain DO ALL
| 2 |
Goes Wrong Power Wheelchairs
Drive your Powerchair by Radio Control
Powerchairs & Range
Off Road DO ALL Indoor & Outdoor Powerchairs
Off Road ONLY Outdoor Powerchairs & 4x4
Manual or Electric Wheelchair?
Why ALL Powerchairs
NEED to be Off Road Capable!
Choosing a Suitable Powerchair
AND ELECTRICAL (POWERCHAIRS & SCOOTERS + MOTOR VEHICLES):
Batteries for Both Vans & Power Wheelchairs
Inverters & Chargers
Very flexible charger!
Fast Charge Your Power
Which batteries to buy
FROM A WHEELCHAIR" VEHICLES:
Grand Caravan 1
Grand Caravan 2
Dodge Grand Caravan 3
Dodge Grand Caravan 4
Latest 2008 2009 2010
Disabled Converted Dodge Chrysler And Voyager Minivans
Suzuki Wagon R
Kia Sedona - soon!
USED VEHICLES & OTHER
Disabled Adapted Cars
& DRIVE BY TRANSFERRING:
Grand Caravan can be used to transport up to 4 Wheelchair Seated Occupants
Citroen Berlingo - soon!
Fiat Multiplas (Wheelchair
passenger travels in the front)
Kangoo ASSIST (wheelchair
passenger transfers & drives)
Puncture proof tyres
Run Flat tyres
Tyre Weld Aerosol
Hand Controls Manual
Hand Controls Electronic
Van / Car Door openers
Van / Car Wheelchair Tie Downs
Used Disabled Equipment for sale
How to lose weight FAST!
Email about modifying powerchairs
Keep it looking new 1
Cars are a Joke!
& About Me
Power Wheelchairs and LITHIUM BATTERIES. The future is already here!
Specifically LiFePO4 - the safe lithium...
It is 2011 as I am writing this. I have been
messing about with Lithium batteries for around five years now.
I am using lithium for my
PowerChair Related ONLY Menu
technology is a HUGE improvement over the old heavy Lead (Gel) batteries used in
almost every powerchair since the second world war.
are the HEART of any electric vehicle. They are the single most important factor
by miles in the design and performance of a powerchair or scooter.
So why are
the Power Wheelchair and scooter manufacturers not all embracing this huge leap
in technology? (I would just love to know!) ...
The advantages are many. Here are just a
- At least double the range
is easily possible. Often MUCH more! This means lots to some users.
- At least double (or triple) the
speed with greater levels of torque is possible. See my
- Much lower weight, and battery
size is possible in a smaller narrower
powerchair. Typically much less than 1/4 the weight for the same
"sized" battery in Amp hours. And half the physical size.
- MUCH faster charging
- typically 1 hour for a full charge.
- Much longer, greater lifespan,
like 2000 to 3000 cycles compared to 350 to 500 for good Gel batteries used
now! New batteries every 10/12 years instead of every 2 to 3 is easily
This technology is no longer new. People and companies are
using Lithium Ion Phosphate batteries like the A123, CALB, Headway, and many
others to build everything from electric cars to bicycles. All of this
lithium batteries are made in China. I will show the best/most popular for
electric vehicles use below.
Are their any disadvantages?
Yes. Cost. And convenience....
Right now it will cost about 3x as
much as your existing lead/Gel batteries. But given that they will
give better range, better performance, lower weight, faster charging, and last
much longer then its really actually cheaper! Its just painful to begin with!
And you wont find them in your mobility dealers shop! And may need to order
separate cells to make up your battery packs as I am doing.
You need to be willing to be an experimenter, and to make up wiring and be
able to figure it all out. To do this you need to understand these batteries and
how they differ. Its not too complicated so bear with me!
Right now there's nobody to do this for you. Hence this page... Or maybe more
Can you just fit a set of lithium batteries in
your existing powerchair?
Well the answer is yes. And no. You "can" if you understand
what you are doing but its not quite so simple as that. I can
because I understand what I am doing. To begin with you need to understand
the different "common" types of lithium batteries, their cell voltages and the
dangers of some types.
LiPo batteries While its relatively easy and
cheap to get hold of very powerful Lithium Polymer
(LiPo type) lithium batteries as used in model aircraft, and model
helicopters these are sadly unsuitable for our usage for several reasons.
To begin with they are easily punctured, which causes them to
smoke and burn... As does charging any one of the 7 individual cells above
These LiPo batteries are cheap, this is a 10Ah one. It is
"35C" meaning it can have 35 times its capacity drawn from it in Amps. So it can
produce 350 Amps if a thicker cable was used! It can start your car. And
its barely bigger than a coke cola can. To replace a pair of 50Ah lead acid
batteries in your powerchair would require 10 of these connected in parallel to
provide the same range. But that would take up 1/3rd of the space! And be 6
times lighter. So you really need to add 3x more capacity. So as to get an
advantage over your old lead batteries. So instead of replacing Ah with Ah you
could increase it by 3x because in the same space 150Ah will fit. And still be
Each one has of these has 7 cells (to give the closest match
to a pair of 12v powerchair batteries) and a 4.200v charged voltage per cell. So
it will be at 29.4v fully charged. When charging you MUST use a special charger
like this one here to
ensure that all cells are charged to the exact same voltage or a fire can easily
29.4v may or may not be compatible
with your powerchairs control system. I tried it on a Pilot Plus system and it
seemed OK but don't take my word for it In any case the manufacturer will say
no! You must take the risk and test it. But since this type of lithium batteries
are very flammable and unstable they are not suitable for power wheelchair use.
Lithium Ion - as used in cameras and laptops.
Much of what is written above is also true of these lithium Ion batteries. So
they also are pretty unsuitable for power wheelchair or scooter use. They are
also only usually available in smaller capacity cells so building packs is too
expensive and heavier than the above. These are 4.1v charged or 4.100v charged.
(usually) And they have a metal shell, so are heavier, although stronger.
Punctured cases as can happen with the LiPo batteries above is more difficult.
Lithium Iron Phosphate OR LiFePO4 cells.
These are sold as A123, Headway, CALB etc. These are the ones we need for
powerchair use. They are available in both round tubular cells, like huge AA
batteries. or in big "prismatic" cells. Such as the CALB cells are available in
BIG Ah sizes. The cylindrical calls are available in smaller sizes. They are
easily made into packs that are the correct size for a powerchair. Using nothing
more than a spanner! These cells are SAFE. There is probably less danger than
the ones in your powerchair now.
But unlike the two lithium's above their energy density of
LiFe cells isn't quite as brilliant. It is about twice as good size for size,
weight for weight compared to your Gel batteries though!
So these are what I am using in my latest powerchair currently
This will allow both 12.7 MPH and
50+Km range easily at the same time while saving 60lb of weight!
And allows for sensible off road capability and
fat high floatation tyres for ride and soft surfaces like sand.
The one opposite is 10Ah. 12Ah, and 16Ah
Headway cells are also available.
These are charged at 3.600v and 8 are needed in series to give
28.8v which is the nearest you can get to a pair of 12v power wheelchair
And then use these sets of 8 in multiples (in parallel) to
give you your desired capacity in Ah.
Typically you will be able to get 100Ah in the space where
your 50Ah batteries were removed.
These need to be balanced when charged up. And again I will
use the excellent and cheap Hyperion charger
The cell opposite is available in 40Ah up to hundreds of Ah and is completely
safe and will not burn. You would need 8x 100Ah ones to fit into the space that
your two 70Ah group 24 batteries care now for eg.
They need balance charging, and *should* work with most powerchair
controllers as used today. As long as you ignore the battery gauge which will
likely be a little confused!
If you have any more detailed questions or want to join a few like minded
individuals, there are a bunch of us playing with lithium's on my forum here
who will be only too pleased to help!
And no, there is no "direct easy" replacement lithium's. Nor will that ever
be likely! Powerchairs will be redesigned lighter and smaller with better
tyres and suspension to take advantage of the smaller batteries, and control
systems developed to work with lithium's over time. Its just that some of us are
bored waiting and are doing it now...
PowerChair Related ONLY Menu