BOSCH BLP20L Lithium PowerSport Battery - Group 20, 12V, 420A

Nice battery, super light, I wasn’t expecting that. Highly recommend.

This battery mounted right into my 2016 Harley Davidson ultra glide ultra Limited without any issues the bike fires right up no problem even on the coldest mornings I’ve tested it down to 30°. I do keep my bike on a trickle charger all the time, but I would do that with a normal battery anyway so I can’t say anything about it adding or taking away from the performance of the battery I did have to make a slight adjustment to the mounting tabs just bending them out a tad bit it was not a problem. There was no danger of them breaking as long as you do it carefully and once it’s mounted in there, it’s fine. I didn’t weigh the old battery and I didn’t weigh this new battery, but it is probably a quarter of the weight of the regular battery I had in there before.

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!

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.

Seems to hold the charge well and has made it through the first season. We'll see how it fares through the winter but so far so good. Well priced, good quality.

Replaced dead battery in Jetski which was kept on a good quality trickle charge. Very hot here so I old battery cooked @3 years old. Have had this battery for one year so far and zero issues.

Had a problem they fixed it I have gotten them in the past never had a problem with them just this time maybe got a lemon bound to happen at somepoint but they were cool and sent me a replacement. Thanks my bike will have e start again and I can stop kicking it lol

Really pissed off I spent $100 on this crap. It didn’t even last a year. I can’t get a replacement on them or a refund. I will not support BOSCH again when they can’t replace this. My bike was kept in a garage and treated correctly following their directions listed. Bad value for your money. Read all of the comments almost identical to the same issue I am stating. I deserve my money back.

la garantia de 18 meses que dice amazon que tiene y en el mismo empaque viene no se quieren hacer cargo mi bateria fallo en el mes 13 y primero que le diga a bosch le digo a bosch y me dice que hable con amazon me regreeso con amazon y me dicen que no pueden cubrirme la garantia por politicas internas violando claramente el artículo 79 d ela ley federal de protecion al consumidor.. intentare apelar a amazon via legal ya que si venden en mexico tienen que apegarce a las leyes mexicanas...