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I’m not too sure about the charger. Not something I’ve dabbled with yet. Try looking up the charger model and what the red flash means. I have an old charger but have seen there’s a newer one that does storage mode. Make sure you aren’t set on that as it will only charge to 60% Does the battery...

Says whilst and without charging. Holding the button down goes into test mode. Double pressing shows how many charge cycles completed.

Co Correct, those thicker wires. Keep us posted

I personally tried going off the main battery posts directly to the battery and it did charge to 41v but when push the battery button it only displayed 3 bars out of 5 for charge. I later charged via the discharge wires and it fully charged the battery and appeared to wake up the BMS so to speak...

@Zola you could try charging the way I did above. Connect the positive and negative terminals of the charger directly to the positive and negative terminals on the discharge side of the battery. When I did this the battery was recognised by the charger and it started to charge and illuminate the...

@cream you’re a legend. I did exactly that… I didn’t earth the 5th lead just connected charger to the discharge terminals and it started charging and the LED display on the Energypak started climbing like when I plug a good battery to charger on charge port. So far so good. I will see if it...

Discharge ports read basically nothing still but if I earth the 5th wire which is white and right next to the negative I get battery voltage at the discharge. I might try back feeding it through there.

Th Thank you again for your help. Charge port is reading battery voltage but when I connect the charger nothing happens. I don’t think I will even attempt the charge mosfets. In theory I could get to the back of them but I wouldn’t know what to do once I even locate them.

Excellent. Thank you for your help. I have bridged it with a 30A fusible wire and the battery powered up the bike. Charger doesn’t detect it but at least I can ride again.

Hi @cream the SFC fuse is blown. How would I go about removing it? Soldering iron? The top plastic cover came off and revealed burnt section. Fuse looks like it says 30 Amp K10 Not sure where I would find something like that or what the K10 means

Have you done any further testing or research on these batteries? Did you manage to fix them? Thanks

@cream how do I test these mosfets? Are there 3 pins or just 2? Have done some light reading into mosfet testing but am not confident. Can you see any fuses I should test?

I have checked the packs of cells and the values are all 4.1v in the circled areas, the whole pack combined is reading 41v. How do I check the mosfets and SFC fuse? I have taken a few photos. Tried removing some of the silicon. I continuity tested the mosfets 2 are off limit and 2 are 598ohm

@cream have you had any experience with the 400W Giant energypak? I have one that won’t charge, bike doesn’t turn on. Did you ever find out if you can unlock the BMS or have any pointers on how I can put this battery into the right mode for it to power the bike? I will attach some pictures...

Looks like I am in need of a new battery. If you have a spare and willing to sell, send a message. Giant Energypak side load 400, 500 or 625

Holding down the button to show charge percentage on battery puts it into diagnostics mode. It will show stage 1 refer to picture. Release button. After it shows the result for first stage you press again to show second stage, then again for third and fourth stages.

T 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...