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Giant Energypak BMS reset

Jpirga

New Member
Oct 12, 2024
23
3
Perth, Australia
Hi all, I have a Giant Energypak 400 that won’t take charge. Charger doesn’t recognise it and bike won’t turn on.
Does anyone know of a BMS reset as such?
 

offroad

Active member
Dec 29, 2021
45
36
Wanaka, New Zealand
Many battery 'problems' are related to chargers. Firstly check the LED sequence on the Giant charger at start up, RED - GREEN - RED. If the charger detects zero volts or +42v it assumes there is no battery connected or the battery is full.

Measure the battery voltage and measure the charger voltage. Giant 4A chargers have an output fuse that can burn for the right reason and 6A chargers have both input and output fuses which do the same. Unfortunately, fuses are on the motherboard... funny that ?

If the charger is cactus check eBay (AU) for the aluminium variety with user replaceable fuses in both Giant 3 pin XLR and 5 pin version.
 

Jpirga

New Member
Oct 12, 2024
23
3
Perth, Australia
T
Many battery 'problems' are related to chargers. Firstly check the LED sequence on the Giant charger at start up, RED - GREEN - RED. If the charger detects zero volts or +42v it assumes there is no battery connected or the battery is full.

Measure the battery voltage and measure the charger voltage. Giant 4A chargers have an output fuse that can burn for the right reason and 6A chargers have both input and output fuses which do the same. Unfortunately, fuses are on the motherboard... funny that ?

If the charger is cactus check eBay (AU) for the aluminium variety with user replaceable fuses in both Giant 3 pin XLR and 5 pin versio

Many battery 'problems' are related to chargers. Firstly check the LED sequence on the Giant charger at start up, RED - GREEN - RED. If the charger detects zero volts or +42v it assumes there is no battery connected or the battery is full.

Measure the battery voltage and measure the charger voltage. Giant 4A chargers have an output fuse that can burn for the right reason and 6A chargers have both input and output fuses which do the same. Unfortunately, fuses are on the motherboard... funny that ?

If the charger is cactus check eBay (AU) for the aluminium variety with user replaceable fuses in both Giant 3 pin XLR and 5 pin version.
Thanks @offroad
The charger is the 3 pin, on another battery it detects and charges fine. The LED on charger goes from green to red when connected, battery LEDs light up to show charge level and when full the charger LED goes green.
With my faulty battery it just stays green.
So I don’t think the charger is at fault.
 

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