I have one of the Dolphin batterys, 48v 11.5ah from BMSbattery.com. My charger no longer charges the battery. I tested my friedns charger and it works fine so I know it is the charger. I am curries if I can get a faster charger for this battery, like 500 or 1000w. Is there a max speed for charging this battery? Will it damage it if i get anything other than the standard 180w 3amp charger?
Can I get a faster charger for this battery?
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wesnewell
100 GW
You meed the specs on the battery pack to determine the max charge rate. That includes the max charge amps of the bms used. It has a max charge rate limit. That will be whichever is lowest of the batteries used and bms used. Most 18650 batteries have a .5C or lower recommended charge rate. Most bms's used in those packs are 5A max or less.
cycborg
1 kW
The simple answer is: if you're going to buy a single inexpensive charger, stick with a 3 A model. If you consistently charge at a higher rate to full state-of-charge, your battery won't last as long.
If you step up to something like Grin's Satiator, you could progam multiple profiles, and use a 3 A profile most of the time, but also program a higher-rate profile that only goes to 80% SOC for when you need to dump in a bunch of charge quickly. Or do the same thing with two cheap chargers, one for slow full charges and one for fast partial charges.
500 W would make me uncomfortable, and 1,000 W sounds nuts for this battery. I wouldn't go higher than 8 A for the fast charge. Which, as I said, would only be used rarely and not for a full charge. As wesnewell mentions, your BMS charging limit may not even allow that.
If you step up to something like Grin's Satiator, you could progam multiple profiles, and use a 3 A profile most of the time, but also program a higher-rate profile that only goes to 80% SOC for when you need to dump in a bunch of charge quickly. Or do the same thing with two cheap chargers, one for slow full charges and one for fast partial charges.
500 W would make me uncomfortable, and 1,000 W sounds nuts for this battery. I wouldn't go higher than 8 A for the fast charge. Which, as I said, would only be used rarely and not for a full charge. As wesnewell mentions, your BMS charging limit may not even allow that.
t_tberg
100 W
charging at a high c-rate dosent have nearly as detrimental effects as consistently charging to 4.2v per cell
cell_man
100 kW
The DC2.1 charge connector, that is used on these cases and many other cases, are 3A rated. If you try to charge at much higher current, than 3A, you'll likely melt the charge plug/socket.
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