New 52V21Ah battery was stored for 30 days fully charged. How bad is it?
- Thread starter regan03
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docw009
10 MW
What was the voltage on the battery when you got it?
I've bought three UPP packs in the past two years. Always shipped at nominal cell voltage of 3,7. I wonder if they ever charge them.
I've bought three UPP packs in the past two years. Always shipped at nominal cell voltage of 3,7. I wonder if they ever charge them.
docw009 said:
Not sure if what you mean is 3.7V is good or bad. I'm quite new to this ebike thing.
Have not measured the voltage with a multimeter, I don't have one. The battery's display lights shows it full. Which I guess should mean is 58.8V or close to that. Far from the recommended 40%-60% I guess.
dogman dan
1 PW
Lets go back to the real world. If you are gonna use this thing much, you will have it full charged most of the time. How you gonna ride it every day, unless you keep it full and ready to ride? It will be full so you can hop on and ride anytime. Yes, it costs you some lifespan, but a decent battery lasts 2-3 years, even when stored full. When winter comes, you need to store it full so the bms does not drain one or two cells empty, ruining the battery. Better would be disconnect the bms, and store half full. But in many modern bike batteries you cannot easily disconnect the bms. So if that is the case, store it full. Less wear on it to store full, if its cold. Recharge it monthly all winter. Little harm stored full and cold.
If you will use it only on weekends, charge it only on friday, and store it during the week half charged.
To restore the battery to balance after winter storage, or the shipping, charge, let sit 30 min, ride around the block, charge. Repeat this a few times to spoof the bms to balance the battery repeatedly, filling up those few cells that power the bms while it sat.
If you will use it only on weekends, charge it only on friday, and store it during the week half charged.
To restore the battery to balance after winter storage, or the shipping, charge, let sit 30 min, ride around the block, charge. Repeat this a few times to spoof the bms to balance the battery repeatedly, filling up those few cells that power the bms while it sat.
LeftieBiker
100 kW
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Maybe the BMS is set to limit the full charge to something less than 100%. Lights on the pack don't mean that much: the four lights on mine are all lit at about 80% charge. Anyway, you can make up for whatever loss occurred by taking the extra step of only charging to full right before you use the bike, and leaving it at very roughly 40-60% charge when it's sitting.
DD is right **if** you want the bike to be ready to go, your usage patterns are not predictable.
Storage means "while not in use" ideally even overnight but in practice say a few days at a time.
Someone only using it for shopping trips and commuting to work can optimize for longer lifespan more easily.
Storage means "while not in use" ideally even overnight but in practice say a few days at a time.
Someone only using it for shopping trips and commuting to work can optimize for longer lifespan more easily.
LeftieBiker
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I keep my packs at 50-75% so if I need them full or near full I only need to charge for an hour or at most two before leaving. I have yet to wear out a lithium pack.
docw009
10 MW
regan03 said:
Ahh. This was my first suspicion. U,P.P. ships their packs at nominal voltage, which is going to be around 48V if you had put a meter on it. You cannot really go by the battery display if it''s a digital readout.
Anyway, as someone else already pointed out, it's against the hazmat regulations to ship a fully charged pack. and no one wants the huge fines if caught doing that.
So I think there's nothing to worry about,
regan03 said:
Unfortunately, that's not what it means. Those crude capacity checkers are notoriously inaccurate and not proportional to state of charge. I only use them as an indicator of "OK to run" or "not OK to run" when I'm testing a new e-bike conversion. In my experience, when they show anything less than completely full, the battery is already tired.
Maybe they're calibrated for SLA cells or something? I don't know, but they don't work as you'd hope.
LeftieBiker
100 kW
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I suspect that the purpose of those lights is to encourage people to run the vehicle at less than 100% SOC. I get 4 (all) lights green at about 80% SOC and that's plenty of charge for most rides. Since they are built into a modern lithium pack I don't think they were meant for SLA packs.
