First, is it really the battery?
Range drops for many reasons, and not all of them are the battery. Before you spend money on a new pack, rule out the simple things. A bike that suddenly covers half its usual distance often has a small, cheap problem.
- Tyres low on air make the motor work harder. Check pressure every week.
- Brakes rubbing on the wheel waste power. Lift the wheel and spin it: it should turn freely.
- A heavier load, a passenger or steep roads use more battery.
- Riding at full speed all the time drains the battery much faster than steady medium speed.
Charging habits that shorten battery life
Most battery damage comes from how it is charged and stored. Small changes here can add months to your battery's life.
- Don't run the battery to zero again and again. Charge when it is around 20 to 30 percent.
- Don't leave the bike on the charger all night, every night, unless the charger cuts off properly.
- Use the charger that came with the bike, or one with the same voltage and rating.
- If the bike won't be used for a few weeks, leave the battery about half charged, not full and not empty.
Heat is a battery's enemy
Pakistani summers are hard on batteries. Parking in direct sun for hours and charging a hot battery straight after a long ride both speed up wear. Park in shade when you can, and let the battery cool for 20 to 30 minutes before charging.
When the cells themselves are weak
Every battery slowly loses capacity with age and use. Signs of weak cells: the meter drops quickly from full, the bike slows down sharply on small hills, or it switches off while the meter still shows some charge. One weak cell can pull down the whole pack.
Sometimes only a few cells or the BMS (the battery's protection board) need repair, which costs far less than a new battery. A proper test tells you which one it is.
When to get the battery tested
- Range has dropped a lot and the simple checks above didn't help.
- The battery gets very hot while charging or riding, or you smell burning.
- The battery case is swollen, cracked or leaking. Stop using it and get it checked.
- Before buying a replacement, so you don't pay for a new pack you may not need.