ExpertPower 12V 10Ah Lithium LiFePO4 Deep Cycle Rechargeable Battery | 2500-7000 Life Cycles & 10-Year Lifetime | Built-in BMS

I bought 2 of these batteries to build a back up power supply for two applications. The first was to run my small QRP ham station in a box that was intended for use during hurricane season here in Florida and the second was to power my cable modem when the power went out (happens a lot here in Florida). The batteries, installed in a plastic box, (purchased from Amazon) worked excellent for either purpose. However, one day, they simply stopped working. (zero output) While unsure of the actual failure I suspected I had shorted them our during charging and felt sure I now owned two bricks.I sent a note to the company and during a long series of exchanges i found that the built in BMS likely went into a safety mode and if I put a small charge at 14.4 VDC i might recover them.Sure enough the Batteries came back to life and they work perfect.I sure never expected that .... I asked for and received the specifications for the BMS. After reading the specs and further discussions with their tech in California I found there were numerous protections built in and the price for the batteries is very justified. Definitely would recommend them.

This battery installed OK into a CyberPower 1500VA PCS Sinewave UPS. But when a small power blip occurred; all my lead acid UPS systems had no problem but the CyberPower 1500 shut off. I think this was because the UPS thought the battery was charged and even indicated with a 300W load that it had 32 minutes run time. But it was wrong. The load was shut off and the UPS shut itself off. I'm not disparaging either this battery or this UPS. Just, they don't work together most likely because an SLA charger will not charge this battery. See the answer to the first question for more detail.

The best advice anyone can offer is, know the application and purpose you are purchasing a battery. I bought this for a lightweight use. I wired it using the existing positive and negative poles. Then added a disconnect section to the wired power circuit plug for my charger to attach to the battery. When needing a charge. Works great, with a respectable amp hour for its size. I mounted it with a hook and latch Velcro to the bottom of my carbon fiber panel.

These batteries do not last as advertised. They are definitely not deep cycle batteries.

I used this battery for maybe an hour every three months, for two years. Approximately 8 hours total. It has been safely secured in a protected, dry environment. It is completely dead and will not charge. I had a battery store inspect it to confirm. This is not a reliable product, and despite the seller's claims that there is a 10-year expected lifetime and an "Unwavering Warranty and World-Class Tech Support", there is no way to contact them for assistance.