ECI Power 12V 5Ah Lithium LiFePO4 Deep Cycle Rechargeable Battery | 2000-5000 Life Cycles & 10-Year Lifetime | Built-in BMS

I was quite surprised at how light in weight these batteries are compared to the deep cycle batteries I was using in my boat. I'll be buying two more for my smaller 12' V-bottom boat. The smaller boat I have to really watch my weight as I load the boat and when I'm on lakes where I can only use an electric motor, I've had to lug a heavy deep cycle battery, These batteries were so light I carried 2 of them down at a time to my pontoon boat. I use one for the trolling motor and one for the anchor winch. I've been using them all summer so far and it's not died down as a regular deep cell battery would. I even had a problem one night with the gas engine not starting and I had to use the trolling motor to get the 24' pontoon boat back to dock. I would estimate that I've used the trolling battery for about 18 hours so far and it still powers my trolling motor as it did when I had it fully charged. I did read that I could hook the two together in either series or parallel, I suggest reading up online on the advantages and disadvantages of both hookups. Next summer I think I'll buy 2 more and hook 2 in parallel to each of my devices and see if I can make it through the summer. I also thought about getting a solar panel to charge the batteries, that way I wouldn't have to worry about taking them off the boat till it's time to store them for the winter. I'll update you on how they handle solar charging once I do that. The only drawback that I found was that you have to use electrical terminals to make the connection as the terminal posts are too small for conventional battery cables to hook to.

Works great. Used it to replace a lead acid version in my Chamberlain garage door opener. I did have to trim one edge of the negative terminal. The negative spade on the chamberlain is a smaller female spade terminal. I used a straight cut metal shear to do that. Easy peasey.

Customers should know the terminals are size F2 larger than F1 terminals which my accessory requires.I researched this battery type after the fact and realized it’s a quality product. I appreciate how night weight it is compared to a comparable regular SLA battery. I also researched and discovered I can (and did) purchase adapter terminals F2 to F1. Therefore I am looking forward to service from this battery type.

I purchased this battery May 12th 2025, I own several 20Ah by ECI already and have never had an issue.4 months into this battery and it is not charging fully. When I looked at it the retainers were rusted. This battery is used to run a Riptide pool cleaner. I removed it from the cleaner cart and immediately noticed that the battery was "swollen".I put a straight edge on each side + top & bottom, it is swollen on all. I have gone back to one of the 20Ah that I purchased in 2024, Not sure if this is normal swelling but I do not feel comfortable using it.

I haven't been able to decide whether or not this is a compatible solution to the higher priced Tesla recommended 12 volt which is a critical component in the EV design. While it seems to maintain the voltage requirement and doesn't have a high amperage draw I am still having a problem with the high voltage contacter closing due to slow bus bar voltage when the car is switching from 12 V to high volt. I will probably buy the recommended one to rule out and update accordingly. However this battery does seem to maintain voltage for an extended period and doesn't dissipate like a wet battery would. I suspect this battery holds true to the description and would be a great choice in comparison to legacy type batteries. I appreciate the direction this technology has to offer, it's size to weight to output and longevity are superior without question. Seller was true to delivery time and provides a good product at a fair price.

I have several of these batteries that I purchased off Amazon. The last one received was missing the terminal bolt and washers. I contacted the company about the issue and they replied within several hours (I was impressed by that) and apologized that something was missing from my order and they would send replacements out. 2 days later I had a FedEX envelope on my front stoop with the missing hardware! WOW! Not use to that!Now that is service!I use these batteries everyday from Cellphone power to Deer Cam in the wood (last about 2 months) . Never had an issue with the batteries. Great stuff.-Doug

Been running the 10 AH battery for 2 years now on my Garmin 73 ice fishing bundle. Battery lasts 3 times as long as Garmin battery. My brother in-law bought one for his Humminbird Helix 7 his lead acid would last maybe all day fishing. This battery lasts 3 days and we are fishing all day long with them on LOTW in baudette.Lighter and less money.

Batteries seem ok (just installed them though) but the spade connectors are larger than those on lead acid batteries the same spec. That made for an annoying install since I needed to replace the spade connectors on the alarm system to use this.