I would like to replace my heavy battery to a lighter one. My current battery lasts for 5 days, if I could replace it with something that can only last for a day, I'm fine with that but lighter. Is this possible?
My ebike specs are: Motor type, 450w brushless Rated voltage, 48v/20ah
Yes it's possible, but there are a few things to check before getting a new battery:
Some battery systems communicates information to the controller. There are no standards here, so most likely different brands are not compatible.
To know whether your battery has this, check connector between the battery and controller. If it's more than a simple 2 pin (positive and negative) connection to the battery, it's likely you'll need to get a battery from the same brand and ask them about whether it's compatible.
If there's only a simple connection, then you're in luck, as you can use a generic battery as replacement. But there's still a few things to be aware of:
Side note: because of the smaller capacity, you'll be using a wider charge and discharge range on the battery. For Li-ion batteries, this results in shorter lifespan of the battery. Just something you might want to be aware of.
As a rule of thumb, you should get a battery size that will mean you only need to use max 80% of it's full capacity before recharging. This will greatly enhance the lifespan compared to a 100% charge / discharge each time.
