Anti-Gravity Battery

P.Martinez · Post by **P.Martinez** » Thu Sep 26, 2013 7:38 am

Be careful with AGM batteries! My experience with automotive repro. AGM batteries is that charging voltages in excess of 15 will permanently destroy them. I had this happen on my $300 AGM battery in my '67 Corvette - ouch! I had to install a solid-state voltage rectifier as the vintage part was too unstable on charge voltage. AGM batteries also require a very well regulated charger for storage purposes. Not sure if motorcycle AGM's have the same issues, but beware.
Phil M.

Bob750 · Post by **Bob750** » Sun Feb 23, 2014 9:58 pm

I know this isn't the freshest thread, but I thought I'd put in my two cents for any future searchers.

I got to see and feel some Anti-Gravity batteries at the Progressive International Motorcycle Show (Long Beach, CA, Dec 2013). It's not a cheap item. But it is LIGHT. The AG-401 ($120), which our 250s and most of our 305s could get away with, is only 16 ounces. The 8-cell ($180), if you use your 305 as a short tripper, or otherwise run the starter frequently, is only 1 pound 9 ounces. They can be oriented in any manner and are tiny! You can velcro them to any place on or in the bike. If my heavy AGM in my CB750 ever goes kaput (coming up on 4 years of intermittent use, never on a charger, and never has failed to start my bike), I'll get the AG-801. For comparison my Yuasa YTX14AHL weighs NINE POUNDS without electrolyte.

JSharpPhoto · Post by **JSharpPhoto** » Wed Sep 03, 2014 1:36 pm

Bob750 wrote:I know this isn't the freshest thread, but I thought I'd put in my two cents for any future searchers.

I got to see and feel some Anti-Gravity batteries at the Progressive International Motorcycle Show (Long Beach, CA, Dec 2013). It's not a cheap item. But it is LIGHT. The AG-401 ($120), which our 250s and most of our 305s could get away with, is only 16 ounces. The 8-cell ($180), if you use your 305 as a short tripper, or otherwise run the starter frequently, is only 1 pound 9 ounces. They can be oriented in any manner and are tiny! You can velcro them to any place on or in the bike. If my heavy AGM in my CB750 ever goes kaput (coming up on 4 years of intermittent use, never on a charger, and never has failed to start my bike), I'll get the AG-801. For comparison my Yuasa YTX14AHL weighs NINE POUNDS without electrolyte.

reviving this thread again....

I'm thinking the anti-gravity battery might be the way to go for me, since I will be installing a combination rectifier/regulator anyways, in conjunction with the electronic ignition kit.

Here's my list of electrical components:
Battery
Rectifier/Regulator
2 pole keyed ignition switch
Headlight - no hi/low, just on/off
Tail light/brake light.
Electronic Ignition (kick start only) - Likely the charlie's place unit.

Bob750 · Post by **Bob750** » Wed Sep 03, 2014 2:14 pm

Also, please note that despite the company's initials, Anti-Gravity batteries are not AGM batteries.

AGMs are Absorbed Glass Mat batteries that are essentially high-density Lead-acid batteries and are heavy.

Anti-Gravity batteries are Lithium Ferrophosphate (LiFePO4 or LFP) batteries (ie. Lithuium Ion), contain no liquid at all, and are very lightweight and smaller than the Lead-acid equivalent.

Just clarifying, since it seems some are possibly confusing the two...

Ride on!!

G-Man · Post by **G-Man** » Wed Sep 03, 2014 4:55 pm

Good for popping wheelies, too?

G

JSharpPhoto · Post by **JSharpPhoto** » Wed Sep 03, 2014 5:52 pm

Bob750 wrote:Just clarifying, since it seems some are possibly confusing the two...

Ride on!!

Not me. I'm lookng at the four cell anti-gravity. I use AGM batteries to power some of my photography equipment, because they double as sandbags. Not something I'd want ANYWHERE on my bike.

Bob750 · Post by **Bob750** » Thu Sep 04, 2014 11:40 am

Hey again.

Cycle World just posted a nice primer on Lithium Ion batteries. I knew there was more than one type of Li-Ion chemistry, but didn't know there were so many different types.
http://www.cycleworld.com/2014/09/03/battery-basics-why-do-lithium-ion-batteries-cost-so-much/

Anti-Gravity uses a type about which Cycle World says:
"Lithium iron phosphate: lower energy density but long life, inherent thermal safety."

Cheers!