UPDATED RESULTS:
Disclaimer:
I have always used OEM, NAPA, or DIEHARD flooded batteries
and compared 39 different Lithium, AGM and flooded batteries objectively as possible and arrived at the conclusion that the following may represent the best value for lightweight battery, and power at best $$. The below results were based on information available to me at the time from Reseller(Jegs, Advance, Summit etc.) and Manufacturer(West Penn, Interstate, Optima, Braille, etc,) websites and may not be completely accurate. Please do your own research to verify weight, cca, price, etc. Some of the evaluated were motorcycle batteries which note they should not be used for auto use. This comparison did not factor in warranties, reliability, battery life or any other subjective factors that may be of importance to you.
1st off, was able to locate more literature on the Bosch...it appears some websites had weight incorrect and that it is a 40 lb battery thus it has slipped to the bottom of list. If you want a heavy battery with alot of ah and cca for the price than its great but for the purposes of this comparison, it did not make the list.
Following four(4) are flooded lead acid or sealed lead acids.
The OEM Yuasa/Panasonic Battery a group 35 is supposedly rated for 60 ah, 540 cca @ 31.7 pounds. For the weight it actually packs some punch. There is an equivalent Interstate battery 35-1 with 58 ah, 550 cca at 32.3 lbs for $145. Staying around the same weight, the Exide sprinter(bci 35) is also a great value at 68 ah, 650 cca at 35 lbs for $94. If you want an AGM nonspill and more cca, the Optima redtop has 44 ah, 720 cca @ 31.7 lbs for $245.
Dropping to a bci group 26 will get you a NAPA legend of 540 cca @ 30 lbs for $116 or a Die Hard Silver of 575 cca @28.4 lbs for $ 160.
To lose more weight , go into some AGM and LifePO4 batteries:
* alot of AGM batteries are heavier than the OEM and alot of the LifePO4 batteries are more expensive than the ones listed below.
The Motocross /YUASA platinum AGM GYZ32HL give you 32 ah, 500 cca @ 24.7 lbs for $163. The Braille AGM 21 race battery gives you 31 ah, 550 cca @ 21 lbs for $230 or more $$. Please note that the cca is great but the ah is half of OEM which may mean not using radio, tire inflators, accessories, etc. with car turned off and maybe using a battery maintainer during winter months. Again I am not a battery expert on all types of batteries and how car would perform with a reduced ah battery.
There are two LifePO4 batteries that stand out for weight, price and power... And you probably need a battery maintainer/tender for these.
The Mighty Max with 55 ah @ 19 lbs for $385 and the Lossigy with 100 ah? @23 lbs for $349. The ah and equivalent cca need confirmed for these. Antigravity seemed way too $$ for a LifePO4 group 35, although it does have a battery monitor but $830 is out of my price range. Additionally, questions remain such as will any LifePO4's charge correctly from alternator, will they use up charge cycles every time car is turned on, and will excessive engine heat ruin battery ? For those in warm locales, it seems like great option. In cold locales, the battery will start car below 32 F, but will not charge below 32 F. so you need to bring inside to charge which could become a hassle for a daily driver. trying to charge below 32 F could risk explosion. and you cant jump start.(although Antigravity shuts down low battery and saves enough for one last start). Antigravity seems to have alot of nice features but is too expensive and questions remain. Also there is a Powertex LifePO4 with 48 ah, 430 cca @ 13.5 lbs for $599.
Moving into superlight, we have two(2) Li-Ion batteries. You probably need a battery maintainer for these. Please note that Li-Ion could be ruined by excessive engine heat, is more unstable than LifePO4 and more prone to explode than LifePO4. Also the same questions regarding charging in winter below 32 F and using up of charge cycles with every engine start remains. The Shorai is the best value with 36ah, 550 cca @ 5.54 lbs for $ 259. Runner-up is the NOCO with 32 ah, no cca listed, 700 hca @ 5 lbs for $200. Am very tempted to go full out nuts and throw a Shorai five pounder in my daily driver and see what happens.
if a cca or ah was not shown ,it means i didn't find it during search. if anyone has that info, please provide and will update.
Most of these batteries should fit, but again check the measurements.
Some may be smaller which means you may have to adapt your tray, hold-downs and possibly cable connections.
Welcome any corrections, critiques, or suggestions for the above, including if I misunderstand a certain battery technology or how it works.
Again, please do your own research to verify correct information.