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remember that voltage means absolutely nothing. I have 85-90%ish depleted cells sitting here that read 3.2+ volts at rest but were 2.8ish during discharge. They'll quickly drop back after applying a load. you need to decide whether to top or bottom balance; the stonger/weaker cell determines...

I just did this with 8x150ah cells, so about the same capacity. It takes forever, and them some. Set your bench charger to 3.65v. and walk away for a few days. Amps will drop to zero. It feels magical after staring at them eternally at 3.45v. No intervention required. If you want to speed...

did you perform an initial top/bottom balance when you received the cells? c-rating on discharge will move the curve up/down relative to voltage. If a low discharge, like in your case, expect the voltage to sit a bit higher and crash around the bottom 10%.

@fhorst mentions me twice so I must have struck a chord. If you set your charger @ 3.35v they'll slow down and take forever... higher voltage is required to pass current and that's why a datasheet states recommended limits for when the charger/ cell hits 3.65v while charging. Using Higee as an...

You fried the cell because 3.35v is a full charge on the Higee cells and from my observation they won't go higher. You noticed the same and pushed your luck. The datasheet shows the curve & charging parameters to hit the advertised 152ah... 3.65v on the charger until amps hit 7.5 (5%). After...

same timeframe... Ordered from Daly mid-march; purchase protection was extended when I asked for a real update; that expires soon.

It says new and the pricing is reflective of that. If you're worried then look for a specific note of "grade A". Recent CALB cells are also coming with their manufacturer test sheet. I bought 8x152ah Higee cells from BLS, as have many others. Initial impressions are good. Worst case I can...

The 8x 150ah cells sitting on my desk were lightly clamped together in a row and slowly discharged to ~10%. I noticed the bar clamps loosening on discharge. I've charged back up to 3.3v so far and removed the clamps given the discussion... if people think these cells don't swell and...

Understood. I was hoping this would trigger more conversation around the observed voltage variations while charging a 12/24/xx volt bank in series.

I'm sitting here charging my 2p4s bank that I drew down to 11-ish volts while (still) awaiting my BMS ... Impatience to start some low-risk capacity testing has kicked in. My bench charger is currently set to 14v, 5amp max. It's been pegged on CC all day although sometimes dipping to CV and then...

you'll get varying opinions. For me, I support compression. The cells expand/contract slightly with SOC so compression limits potential movement of the terminals & busbars. Data sheets for CALB cells require compression; Aluminum case cells have the same internals with a different case... it...

How are you looking up the QR codes?

Your rebuttal is that your cells won't expand because they're assembled in a charged state. However, they'll contract during discharge which also puts pressure on those small M6 terminals. You mention that contraction is OK but consider the total amount of potential movement; 2mm per cell adds...

question on the fortune brackets... besides compression by the threaded rods, what's preventing them from simply pulling off the top of the cells? They appear to provide horizontal stability but nothing for vertical forces, vibration, etc. I know they're minining/industrual but the pictures...

I didn't pay any tax. Refund was 100% of the purchase + shipping.

I did, but they're some major points: The inverter can't connect to the BP. you need to determine how to handle LVD. You need a solution for pre-charging the capacitors on the inverter.. there are other threads about this. The CC could drain power infinitely damaging the batteries. You have no...

the BP only passes discharge current - You should add the battery monitor but not the charge controller. Sorry if my last comment wasn't clear - I was referring to any device that draws current from the battery. the charge controller will have a small self-consumption value, so there's a risk...

the battery protect should be applied to everything touching the battery. However, they don't pair well with inverters... recommended practice is to wire the inverter direct to the cells via fused link and use the remote circuit of the BP to trigger on/off. Alternatively, a cheap BMS can...

You don't want elasticity. Cells will expand/contract with SOC changes and Higee cells aren't perfectly flat from the factory at 3.295v - the centres are slightly proud. Any allowance for movement will put pressure on the terminals. You need compression to limit movement and expansion. I'm...

I had a similar experience with the Dykbhuang Store (Ordered in January). They kept saying the unit would ship in 3 days, and every 3 days I'd follow up and receive the same message. Eventually they cancelled the shipment... I filed a dispute and received a full refund. I was empathetic to the...

I'm waiting for a few things that apparently departed via air weeks ago but haven't landed in NA. Given that other packages are moving I have a suspicion that some vendors aren't shipping smaller items and faking tracking.

I have, all good so far including great packaging and communication. BLS appears to be a general re-seller selling new cells, used cells and questionable crap. Be sure to thoroughly read the listing to see words such as "new, grade a, etc.".. If not assume otherwise. Also, know the price ranges...

wow... I've been away for a few days and I'm pleasantly surprised to see this thread blow up. :) But I feel like we're getting off topic... can we restart? Question: How are others securing 4/8/xx cell packs together? Guiding Principles: Let's assume the environment is anything that moves...

We all talk about buying cells & testing, but not final assembly How are you assembling to survive mobile/marine/harsh environments?

Any capacity tests yet? my 152ah cells arrived and they pass visual inspection; all measuring 3.295v. But my BMS hasn’t arrived yet. I was surprised to see that aluminum case cells aren’t “perfectly” flat when stacking together, but based on pictures of other cells this appears to be the norm...

Depending on your overall setup, a few bucks more could net you a more capable solution with a commercial-grade product. However, neither method solves the challenge of pre-charging the caps to mitigate current inrush at the inverter. It protects the BMS mosfets but the inverter could still be...

Correct, but you can use the remote on/off switch to trigger the inverter on a fused circuit - it's essentially the same thing and you can now manage your remaining DC loads through the same battery protect. You get an alarm circuit and a warranty, and the option to use a cheap BMS for charge...

I'm not sure I agree with this one. While it works, you're bypassing the safety mechanisms of the BMS and need to ensure you place appropriate fuses in-line with the inverter/load to protect the current draw and a potential short circuit. Factoring safety variables into a design is inherently...

what kind of boat? single alternator? I think the best method of attack would be to map out a holistic view of your electrical system... you don't want to piecemeal it. Maybe consider 24volt for the thrusters, windlass, etc. on their own bank & alternator - many convert easily and you halve...

Some unorganized thoughts... Fortune cells have great connections but are large for their capacity. You could (likely) fit 4 of the Xuba 180ah cells in a group 31 battery box. A better investment may be beefing your entire house bank to LifePo4; I'd guess that you have the appropriate wires...

Still waiting for my two 120a units that I ordered from the Aliexpress link on Will's page - they're responsive to messages but shipment keeps getting delayed; although I have a tracking number in the system... Thanks to all for testing these units. I'm excited to contribute my own hands-on...

you'd need to design your own charging algorithms for the lead acid bank. This is already solved for you... I'd suggest using a DC-DC charger and wire the MPPT, LifePo4 and DC-DC charger together on a bus-bar. https://www.renogy.com/12v-dc-to-dc-on-board-battery-charger/

wow. This kills the BLS deal for the same cells... although those are 2019 vs. these 2018 cells. Be sure to test thoroughly and report back. Thanks for posting the spec sheet.

Between the two of you this is very confusing. you both have screenshots of the same chat from vendor perspective; the cells don't align to what gehowi ordered; than a random excel spreadheet from ?? Then it's all resolved and everyone's in-love again... Given the chat viewpoints, you're both...

you sure? The Xantrex Truecharge support two-stage charging. http://www.xantrex.com/power-products/battery-chargers/truecharge-2-2.aspx