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Watt Cycle 12v 100ah lithium trolling battery

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megalomaniac

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Well, price got to the point where I could justify buying a LiFePO4. Amazon prime deal for $189 for the mini (smaller than a group 24), 20lbs. Has BMS and bluetooth.

Hopefully it wasn't a waste of money, but will shave off a good bit of weight in my skiff. My current lead acid group 27 is 2 years old, and I'm starting to notice a bit of a drop in run time. Will let you guys know how this battery performs (hopefully next weekend, as I'm pulling a 72h shift this weekend and cant go).
 
if you dont mind can you post the cell voltages and what voltage the bms shuts off after charge. ive been keeping up with these shenzhen batteries. it seems like after most of these batteries started having a lot of problems after they started using smart bms'.
 
WTM said:
if you dont mind can you post the cell voltages and what voltage the bms shuts off after charge. ive been keeping up with these shenzhen batteries. it seems like after most of these batteries started having a lot of problems after they started using smart bms'.
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sure, will do...

IF it ever arrives.

I bought it a week ago and still not delivered, got a notification from amazon that if it doesn't arrive today its free.
 
Arrived at 13.1v today... so no free battery 😞

Installed bluetooth app from barcode in manual. Some bull$hit Chinese app... deleted it instantly, but prob too late for them to have already mined all the data from my phone.

Installed the real app from a search on the play store. That one works fine. On charger now.
 

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megalomaniac said:
What are you looking for specifically? Voltage variances between cells???
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cell voltages of 3.3-3.6v with only 0.01v difference between them. in LFP batteries 0.1v means about 70% SOC. the voltage curve is that small. so when you charge one, if one of those cells is low the bms will go into a high voltage cutoff. this shouldnt be a problem if the company top balances them at the factory prior to assembly. what some folks are finding this is not the case for some of the shenzhen batteries, ie powerqueen, chins, weize to bame a few. they will never charge or balance on an LFP charger voltages unless you bring them back to balance by slowly raising voltage and even then some are finding that the bms' are probably defective.
 
Got her all hooked up in the boat, tested the trolling motor and didn't trip the breaker, so decided to pull the group 27 lead acid and leave it at home tomorrow.

New battery should get a workout tomorrow. Close to a 2ft tide change plus 15 to 20kt winds, we will see how she does!
 
Kk, this is officially the best purchase I've made for my boat!!!

Tide RIPPING in the bayous, 15-20k winds. Ran the trolling motor nonstop from 630 till 3. My 2yo lead acid would have died before noon. At 3p, I still had 75% left in this battery!

Also LOVING being able to charge at 20a (really only actually charging at 15.9a) way faster to recharge than the old battery.

Question... with 75% left, is it better to top it back off to 100%, or is it better to use it again and take it down to 25% remaining or so?
 
run it again and then charge it. you want both deep and shallow DOD for the health of the battery. running between 20% and 80% SOC will get the best cycle life. i dont care to get an extra 500 cycles so i run em between 10-90% SOC with a monthly top off a couple of times to balance.

try not to get below 10% or plumb dead or youll severely shorten life cycles. long term storage, ie a couple of months, at 50-60% SOC.

if you care about a warranty i would look at their recommendations or warranty as they might have set parameters to run them and charge them.
 
WTM said:
run it again and then charge it. you want both deep and shallow DOD for the health of the battery. running between 20% and 80% SOC will get the best cycle life. i dont care to get an extra 500 cycles so i run em between 10-90% SOC with a monthly top off a couple of times to balance.

try not to get below 10% or plumb dead or youll severely shorten life cycles. long term storage, ie a couple of months, at 50-60% SOC.

if you care about a warranty i would look at their recommendations or warranty as they might have set parameters to run them and charge them.
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ty!!!

but help me out... what is DOD and SOC? I'm pretty ignorant
 
depth of discharge and state of charge. SOC is what shows up on the app. people over think it by trying to get the most cycles out of their batteries. all you really need to know is keep them above 10% SOC and try not to short cycle them, ie by running them down to 90% SOC or so and charge them back up to 100% and store them for long periods at 50-60% SOC and youll be fine. the cells will probably last longer than the bms. that way you get the most out of your batteries.
 

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