Re: [force_ev] Thunder Sky batteries
- Is a special charger required ?
How much do ni-cads cost and at what range ?
Ni-cads have 4x cycle life of lead acid.
On Thu, 05 Feb 2004 22:44:51 -0000 "fredfischer55" <ffischer@...>
> Searching for Lithium batteries, I came across the________________________________________________________________
> manufacturer's site for these 3.9 volt batteries. The specs for the
> 100 AH model (LP8581A) show that 44 of these could replace
> my Force's 50 AH batteries with space to spare. This would
> double my range. The pack weight would drop from 819 pounds
> to 291 pounds. This would increase the possible payload from
> the current 650 to over 1150 pounds.
> On the downside there is cost: 44 of these batteries cost $6380
> plus shipping. Battery life may only be slightly better then the
> lead-acid pack: at 500+ cycles, far less than NiMH.
> Are there other problems with these batteries? 2x range for 3+x
> cost is bad, what about current drain during hard acceleration?
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- The website:
claims a two stage charger: constant 0.3 CA followed by
constant voltage of 4.25 V per cell. A special Thunder Sky
charger, using "power pulse" technology can charge at 10 CA
(price not shown). The Brusa NLG412 or newer NLG 511 can
do 0.15 CA , followed by a float at 44 x 4.25 V.
When I purchased my Force in 2000, increasing the range by
changing the pack chemistry to ni-cad was a $22,000 option. I
believe Tom Hudson has more recent info on Saft ni-cads.
--- In firstname.lastname@example.org, William Glickman <
> Is a special charger required ?
> How much do ni-cads cost and at what range ?
> Ni-cads have 4x cycle life of lead acid.
- The other thing to be aware of is fire hazard.This type of battery can go into thermal overload and catch on fire-do a search on this type of battery and add fire to the search.There have been several recalls with LI batteries,one I remember had to do with electric bikes.