Bike Battery Size Guide for Pakistan: 70cc, 125cc and Battery Bikes
Most motorcycles in Pakistan use a small 12V lead-acid battery: a few amp hours for kick-start 70cc and 125cc bikes, and a larger battery for self-start models. The safest way to buy is to copy the voltage, Ah and size printed on your old battery. This guide explains common bike battery sizes, dry vs liquid batteries, how to charge one at home, and how a battery bike (electric bike or scooty) battery is different.
Updated 12 November 2026
Bike battery sizes at a glance
Motorcycle batteries are much smaller than car batteries. As a general guide:
- Kick-start 70cc bikes (Honda CD 70 and the many 70cc bikes built on the same design): a small 12V battery of about 2.5Ah to 4Ah that runs the horn, indicators and lights.
- 100cc to 125cc kick-start bikes (Honda CG 125 and similar): a 12V battery of roughly 4Ah to 5Ah.
- Self-start bikes (such as many 125cc to 150cc models, and the Honda CB 150F): a stronger 12V battery, often about 5Ah to 9Ah, because the battery turns the starter motor.
- Very old bikes may use 6V batteries.
Models and years differ, so always read the label on the battery in your bike or the owner's manual.
Honda CD 70, CG 125 and CB 150F
These are the most searched bikes for batteries. On a CD 70 the battery mainly powers the horn and indicators, so a weak one shows up as a quiet horn and slow blinking. On a CG 125 the needs are similar but a little larger. A self-start bike like the CB 150F needs enough cranking power, so a weak battery shows up as slow or failed starting. In every case, match the voltage, Ah, the box size and which side the terminals face, so the battery fits the holder and the leads reach.
Dry or liquid battery for a bike?
Bike batteries come as liquid (acid, with a filler cap per cell) or dry (sealed maintenance-free, MF).
- Liquid batteries are cheaper. Check the level every few weeks and top up with distilled water only. Acid can leak if the bike falls over.
- Dry (MF) batteries need no water, do not leak and usually last longer on bikes that stand unused. They suit self-start bikes well.
For a kick-start 70cc bike either works. For a self-start bike, a sealed MF battery is the easier choice. Our battery water guide covers topping up (How to Check Battery Water and Top It Up Safely).
Bike battery voltage and charging system
A charged 12V bike battery reads about 12.6V to 12.8V at rest. With the engine running above idle it should read about 13.5V to 14.5V. If it stays near 12V while riding, the bike's charging coil or rectifier is not working, and a new battery will soon go flat too. Many 70cc bikes charge the battery only lightly, so a battery that is often used with lights on and short rides may run down.
How to charge a bike battery at home
Use a small 12V motorcycle or smart charger set to a low current: about one tenth of the Ah, so under 1A for a 5Ah battery. A car charger on its normal setting is too strong and can ruin a bike battery quickly, so use only a low or motorcycle mode. Connect red to plus and black to minus, charge in an airy place and stop when it rests at about 12.6V. A full charge from flat usually takes several hours to overnight at low current. Riding for 30 minutes also charges it if the charging system is healthy.
How long does a bike battery last and signs it is weak
In Pakistan's heat a bike battery usually lasts about 1.5 to 3 years. Signs of a weak battery are a faint horn, dim or flickering indicators at idle, a self-start that clicks, and a swollen case. Leaving a bike unused for weeks drains the battery; disconnect the negative lead or charge it monthly.
Battery bikes and scooties: electric bike batteries
Many searches for "battery bike" mean an electric bike or scooty. These run on a large battery pack of 48V, 60V or 72V, not a small 12V starter battery. Older ones use several lead-acid or graphene batteries in series; newer ones use lithium packs, which are much lighter and last far longer. We sell lithium e-bike packs such as the 48V 30Ah, 60V 30Ah and 72V 40Ah. Match the voltage to the controller and choose Ah for range. See the e-bike battery guide (E-Bike Lithium Battery Guide: 48V, 60V and 72V Packs) and e-bike battery prices (E-Bike Battery prices).
Fitting a new bike battery
Switch the ignition off, remove the side cover or seat, and disconnect the negative (black) lead first, then the positive (red). Lift the old battery out of its holder and check the vent tube on liquid batteries. Fit the new battery the same way round, connect positive first and negative last, and tighten the small bolts firmly without stripping them. A new liquid battery must be filled and charged as its maker says before use; a sealed MF battery is usually ready but benefits from a charge if it has stood on the shelf. Refit the vent tube so acid fumes do not reach the frame.
Where to buy a motorcycle battery
We do not list small motorcycle starter batteries in our online store; our lead-acid range starts at car sizes. For a petrol bike, AGS, Osaka, Volta, Exide and Daewoo-branded motorcycle batteries are sold widely at bike parts and battery shops, and the brand's own warranty card is what counts. Bring the old battery or a photo of its label. For cars, trucks and tractors, see our car battery page (Car Battery), and for electric bikes our lithium packs above.
