BOSCH BLP9 - Group 9-12V Lithium Battery - Powersport Li-ion Phosphate - 120A for Motorcycles, ATV/UTV, Snow Mobiles, Personal Watercrafts, Scooters and Jet Skis - 5.91″ x 3.43″ x 4.13″

I don't impress really easy, but I am impressed with this lithium battery. I used it to replace the stock lead/acid battery in my Teryx 800 SxS. Living in Southern Arizona presents challenges with batteries and L/A batteries don't seem to take to the heat well (especially non-serviceable sealed L/A batteries). PROS - Weight (Fraction of what a L/A weighs), Fitment (Even though it is by nature smaller, it is in a case with spacers to adjust to your stock battery holder), Durability (TBD, but so far has already outperformed the L/A). CONS - Just a bit more expensive but anticipate a much longer life.

So I purchased this a few months back and even the first time I installed it, the starting was weak. I connected it to the tender overnight again the following days to make sure that wasn't the issue and even replaced the Stator. Due to an accident in november 2025 my bike had been pretty much parked until february this year, but I kept connecting the battery tender frequently to prevent battery from draining, even though these batteries are supposed to habe built in protections for that. This month as I'm finishing some repairs, to my surprise the battery even when fully charged with a proper battery tender in a day, it is fully drained the next day and there are no short circuits in my Harley or anything, this was even tested with the batter completely removed from the bike. I went against some friends recommendations with other brands, because well, I couldn't go wrong with BOSCH......huge mistake!

Battery is perfect! The adjustability for size is a great option. The terminals in two locations a great idea. So versatile

Like the reduced weight. Has multiple negative posts positions to accommodate various applications. Had to modify terminal connections in order to fit 2020 Electra Glide. Not a big deal, but required bending terminal ends from 90° to 45° to prevent interference/crushing against battery case which could lead to failure.

Fit in my husqvarna fe350 perfectly. Worked great for a long trip.

Those who say these are surprisingly small batteries may have ordered the wrong version. The Group 30 comes with two sets of plastic feet to raise the battery slightly. I needed the smaller set to make the battery match the Harley AGM battery in my Tri Glide exactly. Changing the battery in a Tri Glide isn't tricky, but it isn't fun either. When I removed the AGM battery, I noticed how heavy it is. The Lithium-Ion battery is a fraction of the weight and much easier to handle. I had to bend the primary connectors on the bike to reach the battery's mounting holes. These are normally L-shaped, but the L isn't deep enough to reach the mounting hole. A slight bend fixed this. The Li battery turns the bike over noticeably faster, and the lights, etc., are brighter when the engine isn't running. My only concern is that the capacity of this battery is listed as only 8 AH, whereas the original AGM battery had 30 AH. To counter this, the Li battery charges faster—but the capacity could become an issue if you need to run accessories for a long time with the engine off. I've been a big fan of Li batteries for a long time, and have had one in my previous bike for over a decade. This particular battery was the only one I found here that actually fit my battery compartment, despite claims that others would as well. Measure your battery compartment or check your specs before ordering a new Li battery.

Terrible experience. I bought this for my bmw r18 and it went kaput in 5 months. Try contacting Bosch support. No one ever picks up the call and they are very slow to respond via emails. The customer support experience is absolutely terrible unlike other US companies. Buyer beware. Wasted $220 on this junk.

good