![]() I will remove the battery cover and carefully measure the individual cell voltages and report back. Thanks very much for your reply and insight regarding my "possibly" sleeping battery. BMSs that don't do this, or have been bypassed one way or another, are one cause of battery fires, when the cells get damaged internally because of it. Internal damage to a cell could occur that could eventually lead to a fire.Ī BMS is designed to prevent using a battery that has dropped below a certain point. If any of them are too far below the LVC, you would probably be safer replacing them than recharging them. If none are actually below LVC (which they shouldn't be if the output is still enabled), but are just enough different in votlage to make the BMS not enable the charge port, you may be able to manually charge the low ones up to match the high ones, or drain the high ones to match the low ones. If any of them are too far different from others, or too low, it's possible the BMS has shutdown the ability to charge to prevent problems that can lead to a fire. List those here and we can see if any seem problematic, and advise from there. Measure each pair of wires a 48v pack should have 14 of them, and you will end up with 13 separate voltage readings. These are best measured at the many-wire harness from the cells on the connector where it plugs into the BMS, so you know what the BMS itself is seeing. To do this, you should first check the actual cell (group) voltages. Finding out why is important, before continuing. So it sounds like the BMS has turned off it's input. The charger appears to be putting out the right voltage, so it's unlikely to be a charger or connection problem. A BMS normally can't enable the output if the cells are in any state that would prevent enabling the input, *except* if the cells are too high a voltage-if it was only at 35% charge 11 months ago and has sat unused since then, that's virtually impossible. If the output is enabled, the input should also be enabled. If it were asleep, any load connected to it would not operate, and voltage with the load connected would be essentially zero. If it is driving the motor, it's not really in "sleep" mode, it's actively able to output power. (photos attached of the battery connected to the iZip charger. I have Tektronix O-scopes, lab power supplies, Fluke DVM. I seemed to know more about this 2014 battery than they did. Their service dept did not have any suggestions. The local Seattle iZip dealer has only one iZip bike in stock, sells mostly other eBike brands. What procedure might bring my iZip E3-Dash LiON 48v battery out of hibernation "sleep" state possibly due to charge on cells is below level considered safe by the BMS ? Other battery terminal pair combinations measure = 26v and 42vīike has been great for years and would love the be able to ride it again, this time avoiding low battery charge state. Standard iZip 48vdc charger seems good however will not charge battery, LED on charger = green, => no current draw, but my Fluke dvm measures 54.7vdc at battery spade terminals (outside pair of terminals) with charger plugged into battery charge port. Only bottom two of 5 LEDs on battery light up: RED + Orange, other 3 OFF. Was stored at 35% charge after last use 11 months ago.īattery still has sufficient energy to drive rear wheel motor and energize LCD control panel on handle bars. An answer for me hopefully will help other eBike users accessing this forum with "sleeping battery" issues. Sleeping Battery = Tranz-X, Li-ion 48v, 8.7AH, 418wh battery seems to be stuck in dormant "sleep mode" due to not being used or charged for 11 months.dang. (eBike model = E3-Dash (Currie 2014 IZip E3 Dash), model year = 2014)
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