Ionic Lithium Group U1 12V Lawn Mower Battery 720CA (S8, Bluetooth)
Ionic S8 Group U1: 720 Cranking Amps in the Case Your Mower Already Takes
Nearly every riding mower, lawn tractor and zero-turn built in the last thirty years starts on a Group U1, and the Ionic S8 is a U1 in lithium. At 7.7" x 5.1" x 6.1" it drops into the same tray under the same hold-down, weighs 4.4 lbs, and hits the starter with 720 peak cranking amps (400 CCA).
Ionic builds it for zero-turn mowers above 21 hp and for side-by-sides. Bluetooth is built in, so the Ionic app shows the state of charge before you pull the mower out in spring, and Emergency Start holds back a reserve you can release from the button or the app if the battery runs down.
Why the S8 720 is the everyday mower pick
- Group U1 size, a drop-in for the stock tray and hold-down
- A post on all four corners, so it fits U1 and U1R cable layouts
- 720 peak CA (400 CCA) for zero-turns above 21 hp and side-by-sides
- Emergency Start reserve, released by button or app
- Bluetooth state of charge in the Ionic app
- 4.4 lbs
- 5-year warranty
Ionic S8 Group U1 720 CA Specs for Nerds
| Spec | Ionic S8 Group U1 720 CA |
|---|---|
| Voltage | 12V LiFePO4 |
| Group Size | BCI Group U1 |
| Peak Cranking Amps | 720 CA (400 CCA) |
| Capacity | 9Ah / 115Wh |
| Emergency Start | BMS reserve, released by button or app |
| Cycle Life | 3,000 cycles at 80% depth of discharge |
| Bluetooth | Yes, state of charge in the Ionic app |
| Weight | 4.4 lbs |
| Dimensions | 7.7" x 5.1" x 6.1" |
| Terminals | Four M6 threaded posts, one on each top corner (M6-to-post adapter available) |
| Fits | Group U1 and U1R trays (turn it around to put the positive on your cable's side) |
| Water Rating | IP56 |
| Operating Temp | -4F to 140F |
| Charging | LiFePO4 12V charger that stops at 14.6V |
| Warranty | 5-Year Ionic Warranty |
Lead-acid U1 and U1R batteries mirror each other's terminals. The S8 has a post on all four top corners, negative on one side and positive on the other, so you turn it to put the positive on whichever side your cable is. For the off-season, Ionic recommends its 12V 2A trickle charger.
Backed by Ionic's 5-year warranty. Questions about fit or rigging? A real USA battery tech picks up at 888-274-7544, Mon-Fri 9a-6p EST.