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bass*en*mass View Drop Down
Old Croc
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Joined: 03 September 2009
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bass*en*mass Quote  Post ReplyReply Direct Link To This Post Posted: 05 February 2021 at 9:20pm
lifepo4 is much safer than those 18650 li-ion cells, no fire risks etc..!
the bms is never really built in, its a module that often includes the required balancers to level the typically 4 cells voltage, 3.2-3.3v each, for a 12v norminal battery..
4x 100Ah lifepo4 cells could be had for about 100quid, add the balancers/BMS and a shunt with bluetooth connectivity for convenience..

the discharge/charge currents are about the same as the capacity, the bigger the cells, the larger the currents - i see no problem there re. soundstuff..!


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slaz View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote slaz Quote  Post ReplyReply Direct Link To This Post Posted: 05 February 2021 at 8:38pm
There seems to have been a bit of an upsurge in folk using/considering  this chemistry recently - not surprising as the prices are coming down somewhat.

I've had LiPO for quite a while (RC style ones) and a few bodged up DIY packs from 18650 cells. Mostly quite happy with em .... but never used LiFePO4.

So I'm looking around at them - all seem to come in with strong sealed ABS(ish) industrial-style cases - with built-in BMS. The form factors seem to pretty much ape the standard lead-acid sizes/shapes - which makes sense.

But reading around a bit, I've seen quite some folk having trouble with the BMS's .... and with the buit-in BMS's, any trouble would seem to imply the whole pack would be a write-off ... no ?
Guessing a simple feckin passive component failure would brick the sealed pack wouldn't it ? Don't fancy a 1p R or C or whatever trashing a 200-300 quid battery.

Any experiences in here with that ? Anyone know of batteries that use/can use external BMS ?

Also - I'm assuming these batteries are pretty much designed for use with various types of bike/scooter/golf trolley or whatever - with very different current deliver patterns. Is there any reason to think there'd be issues with sound system use where the current draw will be very intermittent and peaky ?

The folks doing the soundboks (Saturnus) has been supplying them for a while now - would be good to hear his experiences over time ...

REMEMBER....POLITICIANS AND DIAPERS SHOULD BE CHANGED OFTEN AND FOR THE SAME REASON
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