12V 100Ah LiFePO4 Lithium Battery with Bluetooth - BCI Group 24 15000+ Deep Cycle Battery, Built-in 100A BMS & Low-Temp Protection, for RV/Marine/Trolling Motor/Off-Grid/Home Backup

Used these batteries ti upgrade my Ryobi ZT540e from lead acid to lipo. Batteries worked perfectly. The only diferance was that these batteries are about a quarter inch taller so it was a bit challenging to get the lock down frame back on other than that they were an exact fit.If you are purchasing these batteries to upgrade from lead acid remember to purchase a new charger that is compatable with lipo batteries otherwise you could ruin your lipo batteries.Also remember that a charge indicator for lead acid batteries will not indicate properly for lipo batteries so you will need to replace that with one that is compatible with lipo batteries.Final outcome; my Ryobi ZT540e now runs better than the day I bought it. Power level is much more consistent throughout the entire time i am mowing my 2 acre yard plus the new batteries are about 200 pounds lighter so the mower is probably about 20% faster.If you are looking for a battery upgrade for your Ryobi ZT540e, this is the way to go.

Good company. Battery's BMS phone app did not work with my phone, so I shipped the battery back to them and was given a full refund with no hassle. Very good communication over email.

Works great! Used this with a 12V air conditioner drawing about 35 amps. Note that you want a LiFePo4 specific charger. The initial NORCO marine charger I purchased would not start charging until the battery was down to a 10% charge. This was not ideal for my application so I purchased an EcoWorthy 20A charger. It works great and charges fast.