I would like to add an additional battery to increase the range of my Ecotric E-bike. It has a 36V 12 Ah battery. The plan is to mount the additional battery on the rear rack. Do I just connect it in parallel with the frame mounted battery ? How about charging ? Do I need to buy an additional charger ? Thanks.
Adding a battery
- Thread starter Randroid
- Start date
harryS
Well-Known Member
Yes. Just look under the battery cradle for the pos/neg lines and run them in parallel to your rack battery. Promise yourself that you will never connect the two batteries unless they're at the same voltage ( a half volt diff is OK).
The safe way to charge them is to disconnect the parallel connection and charge each battery separately, Two chargers would save time here, and they usually give you one with a battery, but if the connectors are the same, you could use one charge r on one, and then move it to the other.
What is not necessarily safe is to leave then in parallel and try to charge both simultaneously with one charger plugged into pack #1. Pack #1 will charge #2 as it comes up, but this bypasses the charge circuit on #2, and why do that if the purpose of it was to protect the battery.
The safe way to charge them is to disconnect the parallel connection and charge each battery separately, Two chargers would save time here, and they usually give you one with a battery, but if the connectors are the same, you could use one charge r on one, and then move it to the other.
What is not necessarily safe is to leave then in parallel and try to charge both simultaneously with one charger plugged into pack #1. Pack #1 will charge #2 as it comes up, but this bypasses the charge circuit on #2, and why do that if the purpose of it was to protect the battery.
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