WattCycle

WattCycle WT12V314AH200MINIBT

I am on my 4th warranty replacement in a year

Out of 2 batteries purchased for install in my truck camper, one has failed 3 times with a 'no communication error' that shows no information on the app after connecting to the battery. I am currently awaiting a 4th replacement.

WattCycle 12V 314Ah Mini Heated & Bluetooth LiFePO₄ Battery

Free replacement after over-discharge failure

In May 2025 I bought a WattCycle 12 volt, 280 Ah mini (the previous version of the 314Ah mini) and used it to run a freezer in connection with a solar charger and inverter. In October 2026 I accidentally over-discharged the battery and was unable to revive it. It showed only 6 volts and the BMS allowed no charge or discharge. I could connect to the BMS with bluetooth, but could not get it to accept a charge. When I contacted WattCycle about the problem, they had me do a series of diagnostic procedures. When the battery still would not wake up, they agreed to replace it, no charge, with a new 12 volt 314 Ah mini. I have now received the brand new replacement battery. I think this was excellent warranty service and show that the company stands behind its products. They replaced my battery free of charge with a new, higher capacity model, more than 18 months after the original purchase. Kudos to WattCycle!

WattCycle 12V 100Ah Group 24 LiFePO4 Battery

Cheap homemade solar generator

No major issues so far. Purchased from Amazon Sept 2025 for $170+tax. I did discharge to the 0% cutoff accidentally and didn't attempt charging for a few weeks. The 10A charger I was using wouldn't wake it up, but I connected it to a larger 12v battery (Dumfume 300ah), and that woke it up enough for the 10A charger to start working on it. No issues since then I found a plastic tote that fits it well, with some space for bus bar and cables, and have it connected to a 2000w Jupiter (Modified Sine Wave inverter from Harbor Freight) and a USB-A/USB-C/12v Aux module. I use it mainly to charge mobile devices when off grid, or for a diesel heater, and only use the inverter when there is low risk of damaging a device (like when it has an AC to DC converter box inline, or it's a simple device with a resistive heater (cheap rice cooker)). I look forward to using it more, so far no obvious degradation, though I've never done testing to confirm capacity or cutoffs.

WattCycle V2 48V 100Ah 3U Smart Server Rack

I was looking for a 48V battery for my DIY off-grid system and decided to go with the WattCycle V2.5 100Ah rack battery. The 3U design makes it a good fit for a rack cabinet, and having both the app and the LCD screen for monitoring is a nice bonus. I also like that I can expand the battery bank later instead of having to replace the whole setup. For anyone putting together a similar system, I'd recommend checking the inverter compatibility and planning the rack space before ordering.

WattCycle V2 48V 100Ah 3U Smart Server Rack

What impressed me most when I first read about Wattcycle was the price. It was reasonable and affordable compared to competitors. I purchased the 5120 watt unit and the adapter plug to use with my existing Delta 3 plus (with extra 1000w battery) 2000w total which cost almost $600 dollars more than the one 5000w wattcycle battery. It worked flawlessly as an extra battery capacity. I have recently purchased a Delta 3 Pro and added wattcycle battery as an extra battery capacity (more wattage)rather than a Delta extra battery saving quit a bit of money. I planned to purchase another which will extend my storage to 10KW plus 4KW with Delta unit.

WattCycle V2 48V 100Ah 3U Smart Server Rack

These two WattCycle 48V 100Ah server rack batteries, featuring Bluetooth monitoring and active balancing, have been a great addition to my off-grid setup. Paired with two EcoFlow DELTA 3 Plus units, they help create a flexible home power solution that gives me more energy storage capacity and greater flexibility for off-grid living. The combination works well for my setup, and I appreciate being able to monitor the batteries through Bluetooth. Overall, they’ve helped bring my off-grid power system together nicely.

WattCycle V2 48V 100Ah 3U Smart Server Rack

Well built

I recieved this battery a couple weeks ago and I am in the process of putting together an off-grid system now. I mounted the victron gear yesterday including a 48v Victron 3000va multiplus. Etc and a cerbo GX. So I will soon be able to monitor this battery closely. I will keep in touch with my findings. I’m about to go purchase 3 solar panels for the system.

WattCycle 12V 100Ah Group 24 LiFePO4 Battery

For now: works as advertised in a tiny solar boat

For now seems to work fine and well in combination with Victron smartsolar and shunt in my small solar boat powering a 12v 660W Amarew 66lbs trolling motor.

WattCycle V2 48V 12kW All-in-one Split Phase Hybrid Inverter

Good value

This device has been in service for about 3 months without any issues. My only complaint are the idle consumption, thus far. Currently it’s only being used as job site power to run pumps, compressors and power tools.

WattCycle 12V 100Ah Group 24 LiFePO4 Battery

So far, so good

It has behaved as expected so far with no issues. Communication with the seller was efficient. Purchase was in August, 2025. I can't comment on long term reliability.

WattCycle 12V 314Ah Mini Super Bluetooth LiFePO4 Battery

Good value - needed work.

I purchased three of these batteries via Amazon (they were shipped direct from Wattcycle) in March 2026. I was able to use the iPhone app to verify all three were up on Bluetooth and showing proper voltage. I installed them in our sailboat as three in parallel in early May and discovered that one of them (Batt03) was not turning on the output MOSFETs. The charge MOSFETs were working properly as I could charge the battery, but the output would not turn on, in spite of the position of the top switch or software setting. I corresponded with Wattcycle about this and they agreed with me that the BMS was likely defective, and they sent me a new one. When I opened the case to install the "new" BMS I made two discoveries: one, the "new" BMS they sent me was actually an older model that would not fit my battery; and two, the actual problem was that the small cable connecting the top switch to the BMS had been caught in the case joint and been damaged. Repairing the cable restored proper operation, so I reassembled the case and installed the battery. We have been cruising the US East coast since then (it is now October '26) and the batteries have mostly been working fine. One problem I noted a couple weeks ago was that one battery was not turning on the output MOSFETs - in spite of the app showing it to be on. I noted a new setting in the app (which recently updated itself) called "Reset System" so I tried this - and everything came back to correct! I looked up the battery on Amazon and it seems they have made a couple changes internally - on my batteries the heavy cable from the BMS to the top M8 terminals is a piece of heavy braid covered with a cloth sheath, while the new ones use a cylindrical stranded wire. The internal metal frame is also slightly different.