Timeusb 36V 50Ah Trolling Motor Lithium LiFePO4 Battery with Low-Temp Cutoff Protection, Automotive Grade A Cells, Group 31 Deep Cycle Battery for Trolling Motor, Yacht, Marine, Boat, Golf Cart

Good high quality true deep cycling batteries built tough with excellent customer service. Although I've installed a lot of solar since the 1990's, I am now sold on using Lithium Iron Phosphate on home solar installations to replace more typical lead-acid type batteries. Also perfect as an RV house battery. First thing I noticed was that their "Users Manual" was exceptionally well written and easy to read without any confusing language or translation errors. This was a welcome beginning. Communication with the seller, Time-USB is also nothing less than excellent. They gave me a heads-up when the batteries shipped, and they arrived very well packaged with plenty of protection and sooner than expected. If you have technical questions regarding set-up, the folks at Time-USB will be happy to walk you through the process quickly. I worked with Tanya and Gerri, who I found very knowledgable, easy to understand and answered all of my questions completely. I'm liking these new batteries because they are much lighter than Lead-Acid, much safer than most other Lithium-ion types, and if they work as specified, they will be far less expensive in the long run. Unlike lead acid, which can only tolerate about a 50% depth of discharge on a regular basis, you can discharge these all the way down without damage thanks to the built-in battery management circuitboard, or BMS. Although you will get more cycling lifetime if the depth of discharge is more conservative. These batteries work wonderfully along with a good quality, properly configured charger or solar charge controller, like the Morningstar Tristar MPPT series pictured, although custom settings were required. I'm also using Victron's BMV-712 Smart Battery Monitor with Bluetooth to easily and remotely monitor the system's production, battery status and power usage. Another nice thing about LiFePO4 (or LFP) is their very high (99%) charge efficiency compared to lead-acid at 94% or much lower as they age. Speaking of age, if installed and configured correctly, you should theoretically be able to get up to 5x the cycling life from these Lithium Iron Phosphate (LFP) type lithium-ion batteries, perhaps up to 10 years making these a perfect choice for off-grid solar or similar high cycling, high demand battery systems. Lastly, if you should have a problem, Time-USB tech support will resolve it, they also have a 5 year warranty on their products. I've ordered from them 3 times, and always had a good experience. Quality Built Tough!

All I can say is WOW. I bought 16 of these for my expedition marine trawler with 2000w of solar. When I am at anchor I have a full size residential fridge/ a large box freezer/ and a large ice maker/ wine cooler PLUS all the little items that run on the boat. These batteries for last 6 month have had the hell beaten out of them between the solar panels and the diesel generator pumping 100amps of charge through the huge inverter. EVERY day these things get beat on and randomly bank charged from diesel generator and charged by the main drive diesels alternators etc. these things pump out power and take huge charges from all sources. We had 7 people on the boat for 4 weeks and I will say I am IMPRESSED!!!! Way better than my firefly AGM bank they replaced.Bravo for such an great product at such a killer price point ($180 per 100ah battery)Took a chance from buying the expensive battle Borne batteries to save a TON of money,,,, And it is paying off so far!!!!! I’ll update next year after I continuously beat of them moving forward!!! Buy them. You won’t regret

Massive upgrade from the standard lead acid battery. The run life is much longer. It easily charges with a good solar panel and works well even if you deplete it. Also much lighter than a traditional lead acid battery.

Liked size as fit nice in spot it was placed. Worked well after first charge.

These batteries are great!! The Bluetooth allows you to know the state of charge and it’s amazing how long the battery lasts running my trolling motor. I highly recommend these batteries!!

Right now this is the best price per amp hour on the market, even when compared to plastic case batteries. Delivered by FedEx 3 days from placing order in a well padded box with hand grips for the delivery guy.I'm using a smartshunt to measure capacity and it's spot on 220Ah after complete discharge to shutoff.There's really no need to remove two dozen small phillips head screws to see what's inside this great metal case - you can do some research online and make some educated guesses. I expect you would discover a 150A BMS made by Shenzen SaiHang and four massive BYD blade batteries in a nicely spaced, strapped and padded package. You'd likely find silicone wires and solid solder joints on the BMS along with a high temperature cutoff sensor stuck to the side of the pack.There's a warranty so don't open the case to find out. I certainly didn't since I want my warranty.The metal case is well made but isn't tied to ground. It doesn't have a spot designated for a ground terminal that I can find. The handles on top will get in the way if you plan to stack these. They unscrew easily or you can rig up spacer feet on the bottom corners - that's what I did because I'm still building out my solar system and my batteries are only temporarily placed. The handles really help in moving around the substantial weight and the adhesive feet keep the metal off my concrete floor.TimeUSB's customer support reached out to me with advice on what solar equipment settings work best and how to properly charge the battery. I'm impressed with their support - they are far more knowledgeable than most tier-1 agents. Other companies customer support typically repeats a mantra about charging the battery fully to unlock no matter the question.I bought three more of these to make a 48V system while the price is still low. One is at 227Ah. The others are still under test.

This is my second one.Drop-in replacement. Works grate.