Friday, May 23, 2025

Re: [electricboats] Battery Recommendations

My experience with having LFP batteries shipped to me is that they're shipped at around 50% SOC.  So I wouldn't expect to receive a fully-discharged battery.  And fully discharging an LFP battery can be hard on it.  So their comment about it being okay is off, in my view.
 
Prices like what you're seeing ($340 for 1.6kWh) usually indicate 'Made In China'.  Not a guarantee of low quality, but suggestive.  At least they're responsive to your issue; some similarly-priced brands are much less responsive.  There are so many Chinese-brand LFP batteries out there that it's difficult to keep up with the offerings.  And my impression is that a lot of them will miss the mark reliability-wise, as the primary goal seems to be to produce batteries at the lowest cost possible.  Many corners are cut as a result.
 
I recently picked up a pair of 12V x 100Ah LFP batteries from WattCycle for one of my UPSs.  I found that brand on one of Will Prowse's lists of recommended battery brands.  Price was good, and so-far-so-good on performance/reliability (six months in).  But I don't see a 48V model from them near the size you have (32Ah).
 
There are, of course, 'Made In USA' brands of LFP batteries (Battle Born for example).  Prices are usually much higher, and not as many make 48V models.
 
Are there better options?  Probably, but it depends on your priorities.  Usually we want the lowest-priced battery (for its capacity) that is still 'reliable' (won't leave me dead in the water).  But reliability is difficult to determine, and that's usually what you're trading off for a better price.  Battery teardowns can help expose the quality of a given battery brand/model (both design and execution), and that plays a large part in reliability.  I suggest looking for a teardown video of any candidate battery brand/model you have in mind that meets the rest of your requirements (price, capacity, size, weight, ...).
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