WheelchairDriver.com  

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Updated:  10-June-2011

Welcome

1. POWERCHAIR ONLY:
Detailed Full PowerChair Related ONLY Menu HERE

2. VEHICLE ONLY:
Detailed Wheelchair Accessible Vehicles ONLY menu HERE

3. EVERYTHING ELSE:
Detailed Menu of Everything else HERE!


MY OWN VEHICLES:
Dodge Grand Caravan


VW Caravelle VR6

MY HOME BUILT ULTIMATE POWERCHAIRS:
My SLIGHTLY Modified Improved Powerchair

Part 1 | 2 | 3 | 4 | 5 | 6

My VERY Modified Off Road & All terrain DO ALL Powerchair!
Part 1 | 2 | 3


MISCELLANEOUS POWERCHAIR RELATED:
What Goes Wrong Power Wheelchairs

Powerchair Tyres

Drive your Powerchair by Radio Control

Powerchairs & Range


Off Road DO ALL Indoor & Outdoor Powerchairs

Off Road ONLY Outdoor Powerchairs & 4x4
Page 1 | 2

Manual or Electric Wheelchair?

Why ALL Powerchairs NEED  to be Off Road Capable!

Choosing  a Suitable Powerchair

Wheelchair Width


BATTERY AND ELECTRICAL (POWERCHAIRS & SCOOTERS + MOTOR VEHICLES):
Batteries for Both Vans & Power Wheelchairs


Inverters & Chargers

Very flexible charger!


Charging Batteries

Fast Charge Your Power Wheelchair

Which batteries to buy


"DRIVE FROM A WHEELCHAIR" VEHICLES:
Dodge Grand Caravan 1

Dodge Grand Caravan 2
Dodge Grand Caravan 3
Dodge Grand Caravan 4

Latest 2008 2009 2010 Disabled Converted Dodge Chrysler And Voyager Minivans
 
Chrysler Voyager Entervan Diesel

Suzuki Wagon R

More Here

Mercedes Vito - soon!
Kia Sedona - soon!


INSURANCE:
Modified Disabled Vehicle Insurance

Breakdown Cover

USED VEHICLES & OTHER EQUIPMENT:
Disabled Adapted Cars

WHEELCHAIR TRANSPORT
& DRIVE BY TRANSFERRING:


VW Caravelle

Dodge Grand Caravan can be used to transport up to 4 Wheelchair Seated Occupants

Fiat Doblo

Renault Kangoo - soon!
Citroen Berlingo
- soon!
Citroen Dispatch
- soon!
Kia Sedona
- soon!
Volkswagen Sharan
Mercedes Vaneos
Toyota Hiace
Fiat Multiplas
(Wheelchair
passenger travels in the front)

Kangoo ASSIST
(wheelchair
passenger transfers & drives)


ESSENTIAL DISABLED
EQUIPMENT STUFF:

Understanding


Grabbers


Puncture proof tyres

Run Flat tyres

Tyre Weld Aerosol

Fuses!

Spare Key


Wheelchair Ramps

Small Generator

Tools!


VEHICLE ADAPTATIONS:
Control Systems etc
Hand Controls Manual
Hand Controls Electronic
Van / Car Door openers
Van / Car Wheelchair Tie Downs

 


OTHER STUFF:
Used Disabled Equipment for sale

How to lose weight  FAST!

Email about modifying powerchairs

Keep it looking new 1 2

My Accident!


Climate Change

Electric Cars are a Joke!

Disclaimer & About Me

Site Map

Contact

Links

 

 

John Williamson


Powerchair Battery Types Voltage and Compatibility.

Thinking of using better more modern batteries in your Powerchair or scooter?

Detailed PowerChair ONLY Menu

Lithium Power!

I get emails daily and there's much talk on my Message Board about lithium battery power. On the face of it its easy. Just cough up some money and replace those awful heavy lead batteries. But there are a few things to be aware of.

1. There are many types - but three main types of lithium battery. And they all have different voltage and other issues when it comes to powerchairs. Our powerchair batteries are generally 24v (Nominal) and comprise of two lead acid, Gel or AGM batteries.

We need to match this voltage as closely as possible because Power Wheelchair controllers are very "safe" and will spot that something is different! They will then either refuse to work, or give annoying error messages (like over voltage) etc.  There's a chart below showing the exact voltages of each type of battery and you will be able to calculate the best match. The trouble is that every powerchair controller will respond differently here. You may have to take a gamble!

2. These "types" of lithium battery are all different electrically. Apart from voltages, some are very high resistance and so are useless with high currents we need. Some are excellent! Some are much more energy dense than others, and some are little better than the lead batteries we are trying to replace.

3. Some are "safe" in that on puncturing the case, or on overcharging they will not burn. Others explode or burn violently like a firework... Not good if they are under you in a powerchair.

4. Some are only available in small capacity cells, and so need making up into bigger packs. Some are available as large 50, 60, 80, 100 or bigger Ah cells.

5. Some can be charged fast.

6. ALL need either a battery management system, or a charger like the excellent Hyperion EOS1420i-NET3 charger that can balance cells as it charges.

7. Some are easily available, and some are only accessible in large quantities, and supply is sporadic. At least as of 2011 as I write this.

 
Type of Cell or Battery: Fully charged Voltage after standing until  stabilised: CC/CV Charge Voltage: Discharged Voltage (sensible minimum) Comments
AGM e.g. Odyssey &
Wet Lead Acid

Nominal Voltage 12v

12.8v
(6 cell battery)

25.6V
(2 batteries)

38.4v
(3 batteries)

1x
14.4v to 14.7v

2x
28.8v to 29.4v

3x
43.2v to 44.1v

1 battery
12v

2 batteries
24v

3 batteries
36v
 

This is what stock powerchair controllers "expect".

Voltages above Gel voltages may cause errors.

And in all cases including AGM batteries the battery meter will be reading incorrectly...

Gel e.g. MK as used by many powerchair manufacturers.

Nominal Voltage 12v

13.2v
(6 cell battery)

26.4V
(2 batteries)

39.6v
(3 batteries)

1x
14.1v to 14.4v

2x
28.2v to 28.8v

3x
42.3v to 43.2v

 
1 battery
12.2v

2 batteries
24.4v

3 batteries
36.6v

Lithium Ion Phosphate and other variants that are "safe".

Also called:
LiFePO4 cells.

Available as large Prismatic cells.

Nominal Voltage 3.3v or 3.2v

3.60v per cell  
Charge & Charged voltages are almost the same Twice as energy dense as the Lead based batteries and half the weight.   Discharge down to 3v per cell.

3 cells = 10.80v
4 cells = 14.40v
7 cells = 26.60v
8 cells = 28.80v
9 cells = 32.40v
10
cells = 36.00v
11 cells = 39,60v
12 cells = 43.20v
13 cells = 45v approx as I am using HERE

Safe (don't usually burn) and are available as large prismatic cells.

Very suitable as powerchair batteries. Compatibility may be an issue, with warnings or errors on powerchair controllers.
 

Lithium Ion Polymer (LiPo)  that are NOT "safe"...

These burn or explode on any overcharge or cell puncture. Soft cases.

Nominal Voltage 3.7v per cell

4.20v per cell  
Charge & Charged voltages are almost the same - Extremely energy dense, about 6 times as good as lead batteries. Discharge down to 3.5v per cell.

3 cells = 12.60v
4 cells = 16.80v
7 cells = 29.40v
8 cells = 33.60v
9 cells = 37.80v
10
cells = 42.00v
11 cells = 46.20v
12 cells = 50.40v

NOT Safe and would need to be in a fireproof container.

Very suitable as powerchair batteries otherwise with huge energy density.

 Compatibility may be an issue, with warnings or errors on powerchair controllers.

 

Lithium Ion - as used in laptops, cameras, etc.

Nominal Voltage 3.6v per cell

4.10v per cell   Although SOME are charged at 4.2 like LIPO above.

Charge & Charged voltages are almost the same - Extremely energy dense, about 6 times as good as lead batteries. Discharge down to 3.4v per cell.

3 cells = 12.30v
4 cells = 16.40v
7 cells = 28.70v
8 cells = 32.80v
9 cells = 36.90v
10
cells = 41.00v
11 cells = 45.10v
12 cells = 49.20v
 

Usually used in cameras and laptops.

Good energy density, and less dangerous than LiPo batteries but expensive, high resistance and only available in small sizes. Still can explode or burn in some situations.

Nickel Cadmium

Nickel metal Hydride

1.27v, per cell and varies a lot!  Any voltage depending on charge rate.  So charging has to be by series charge, with matched cells, and CC only. 

Charging large packs therefore difficult and not efficient.
1.1v per cell Off load. Difficult to detect as they recover over time slowly. Not really suitable for powerchairs for many reasons.

Detailed PowerChair Only Menu

Lithium Ion Batteries for Powerchairs and Scooters More here!

50v controller I use now here Roboteq Powerchair Controller

 

 

 

 
 

 

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