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How do I know which battery I need?

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Deciding which battery you want may seem complicated at first, but a few simple steps will enable you to select the correct one for your machine.

All scooter / electric wheelchair batteries are 12 volt and are usually fitted in pairs giving a 24 volt output. It is recommended that when replacing batteries they are fitted in pairs.

The power output is marked in amp hours (Ah) on the side of the battery E.g. 12volt 35amp. The amp hour rate may vary slightly from different manufacturers for a similar size battery, therefore the critical thing is the physical size of the battery. The chart below shows approximate sizes in both millimetres and inches for each battery size. Within the product description on mobilitypitstop.com you will find the dimensions of each battery.

  Millimetres Inches
Battery Ah Length Width Height Length Width Height
1.3Ah 97 43 59 3.82 1.69 2.28
2.2Ah 178 34 66 7 1.38 2.5
2.9Ah 79 56 106 3.06 2.19 4
3.4Ah 134 67 66 5.25 2.63 2.44
5Ah 90 70 108 3.54 2.76 4.21
8Ah 151 65 100 5.94 2.56 3.94
10Ah 151 65 114 5.94 2.56 4.61
12Ah 151 99 100 5.94 3.88 3.88
15Ah 151 99 100 5.94 3.88 3.88
18Ah 181 76 167 7.13 3 6.5
22Ah 181 76 167 7.13 3 6.5
27Ah 166 175 125 6.5 6.87 4.94
35Ah 195 131 181 7.68 5.16 7.13
40Ah 196 165 165 8 6.5 6.5
50Ah 196 165 165 8 6.5 6.5
55Ah 229 138 232 9 5.43 9.13
60Ah 259 169 178 10.25 6.625 7
75Ah 260 168 232 10.25 6.61 9.13

The next thing you need to decide once you have identified which battery Amp hour you require, is whether you want a GEL battery or a sealed lead acid (SLA) battery.

Both batteries are sealed, non-spillable and maintenance free. The main difference between them is the performance/longevity. As the battery in a scooter or power chair is the only power source the battery is designed to work differently to other batteries, like car batteries for example.

A car battery is designed for starting the car, therefore it is required to produce a large amount of power immediately as you turn the key, and is then constantly trickle charged. A GEL or SLA battery is designed to give a constant flow of power over a longer period, and then to be recharged fully, this is called a cycle.

GEL batteries produce more cycles than SLA batteries and therefore they have the ability to last longer than SLA batteries. Below is a summary of the two types.

GEL Batteries (See our GEL Batteries)
  • Superior cycle life
  • Maintenance FREE
  • Sealed & Non-Spillable
  • Air Transportable
  • Recommended for power chair and everyday scooter users.

SLA Batteries (See our SLA Batteries)
  • Lower cost than Gel batteries
  • Maintenance FREE
  • Sealed & Non Spillable
  • Air Transportable
  • Recommended for light and occasional scooter users


Alternatively, see all our batteries.

Still have questions? Contact us and we'll do our best to help. Or, return to our Ask The Expert section.






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