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FAQ
- 1) Check if the battery is firmly connected.
- 2）Check if the positive and negative terminals of the battery are connected correctly.
- 3）Check if the battery voltage is more than 12V, if it is less than 12V, please charge the battery first. And you need to use a LiFePO4 adapter with slow charging function to activate the use of the battery.
- 4）Check if the load voltage matches the battery.
- 5）Check whether the load current is more than 20A, make sure it is less than 20A.
- 6）Make sure the discharge temperature is -4℉~+140℉.
Q2: Can not charge?
- 1) Check that the battery is securely connected.
- 2) Check whether the positive and negative terminals of the battery are correctly connected.
- 3) Check whether the charging voltage matches with the battery and whether the charging parameters are set correctly. P.S. Use an adapter with a voltage of 14.6V±0.2V.
- 4) Check if the charging current is greater than 20A, make sure it is less than 20A.
- 5) check if the battery voltage is lower than 9V, if it is lower than 9V, please use a charger with 0V charging function to charge.
- 6) Make sure the charging ambient temperature is 32℉ ~ +131℉.
- 7) After the battery over-discharge protection, disconnect the load and wait until the battery voltage is restored before charging, or use a charger with 0V charging function to charge.
bobwatts
2025-08-20 17:37:13
Long story short....I take care of a cat about 1 mile from my house, so I built a "remote" CatHouse using a highly insulated "cooler" as the house and installed two 12V 25 watt silicone heater pads purchased from Amazon for heating elements. The heaters are wired in series and pull about 1 amp (@12 volts). The heaters are sandwiched between two pieces of rubber backed carpet. (Two reasons to wire in series: they get way too hot wired separately, and I wanted to reduce power to 1 amp. Frankly, they still get too hot)The "house" has a real cat door installed, and it is pretty airtight.But this review is about the battery. I bought two batteries so I could swap them out. Battery gets changed at 7AM and 4PM. So, one battery has to run for 15 hours. I figured that a 25Ah battery would give plenty of cushion for this job.So far, after a couple of weeks, even in below zero temperatures these two batteries (which are enclosed in a separate enclosure for protection) are performing perfectly. I have quick disconnects installed so it literally takes seconds to swap them out.Much to my astonishment, when I bring them home to recharge, they read over 13 volts. This is mildly amazing. I know they are discharging right at 1 amp because I tested this system for days before bringing it to BigBoy (that is the cats name) for use. I have been taking care of him for over 7 years.I know the BMS system is working because I intentionally tried to recharge one the batteries when it was still too cold, and it refused to accept a charge until it warmed up.I have lots of solar "stuff" using LiFePO4 bats, and I have never seen batteries perform as well as these batteries do.I would also mention that these batteries are very heavy, and usually in the lithium "world" weight is a good thing.I'm confident that these batteries are AT LEAST what they claim to be, and I would certainly buy more of these if I needed 'em.I did not receive any compensation for this review, and I purchased both batteries at my own expense.Remarkable product, and extremely well priced.Highly recommended.
C Strand
2025-07-11 18:56:10
This Grnoe 12.8v 100Ah LifePo4 battery is a great battery at a great price. The company also is very responsive to anything that pops up as well. I had purchased another brand that worked well with my pontoon boat and I was looking to purchase another over the holidays. I discovered this battery at $20 less (without a charger that the other one offers). Since I had already purchased the special LifePo4 battery charger, I decided to try this. It arrived packaged very well and in great shape. I especially like that this seems to have better quality batteries in it since it has a higher life cycle of up to 15,000 times versus around 10,000 for most other 100Ah LifePo4 batteries. I also appreciate that the BMS has a documented max cut off current of 300 amps versus 200 on most others. It is also nice to know that it comes with a 3-year warranty which offers a lot of peace of mind. It is tempting to replace my car battery with one of these but since we are in the upper midwest, we frequently go below -4F which is where this and any other LifePo4 battery will stop sending power. If you are in the market for a 100Ah LifePo4 battery, you definitely need to consider those offered by Grnoe.
Tashia Strong
2025-07-01 11:14:42
Very good Battery. Keeps a charge especially in cold weather. It’s a little wider than most 12v batteries I’ve used
Frank
2025-06-30 13:11:27
Overall good experience so far. One battery was about 10.7 volts on arrival, the other 9.7. Well, when I hooked up my charger to the lower voltage one, it must have placed just a small enough load to drop the BMS cutoff, leading to no voltage and no charging. Once my brain kicked in, I 'jump started' the low battery and then connected them together. Hooked up the charger and we are charging happily. NOW, the irritating thing, they are advertised with M8 hardware. Maybe on the bigger batteries, but the 25Ah, nope. Must be an M5 or M6. So my ring terminals don't fit well. That's OK, when I do my permanent install, I will figure it out and get smaller eyelets.
Robert M Cagnetta
2025-01-31 13:31:24
Initially, I had an issue with the first battery shipped to me. Once I contacted the company, Bessie went above and beyond to make things right . The replacement battery works really well and it’s so light to carry on and off my boat to power my trolling motor, unlike conventional batteries. I’m very happy with this product and company . Thanks Bessie !!!
Customer
2024-12-29 11:21:45
Bought this to power my portable ham radio. I already had a quality hobby battery charger. In LiFeO4 mode, it took 27ah to fully charge. I've used it in two-4 hour sessions at 100w radio output, and it works wonderfully. Only consumed 8ah so far.
GH Solutions
2024-12-13 17:42:56
Shipped fast and packed intelligently with lots of foam padding. The terminal screws are included. The fit is good and length is fine as long as you are only connecting one lug. I purchased two of these and both have operated perfectly. Both came in just over 13v. The instructions go about telling you how to drop test them and offer a warranty. The price is right ( $108 shipped ) when they have them in stock. As of today they are now around $175! At that price I would look elsewhere.Update: Still Running Strong 💪 Although the company did not follow through with their promised sales promotion. Because of this and the shifty switcheroo sales tactics they used; I will not be using this company for any future purchases.
Glenn Hudson
2024-11-27 15:33:21
Great battery, strong until it has discharged, charge it up, and it will be ready for service again
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