is this a good battery charger for a dead battery on a joyner 250 i am also going to buy a better battery but i want to keep the new 1 charged i think this is for powersports

http://www.batterymart.com/p-battery-tender-jr-12v-0_75a-battery-charger.html

That's what I use on my Joyner. I don't believe it will revive a battery once it's dead. But, it will keep a battery charged. I also use it to keep my camper chasis battery topped off.

Here's the one I sell, basiclly the same as the one in your link. Mines slightly more amps, .9 amp vs. .75. Same price, but mine includes shipping.

http://www.steelespowersports.com/PartsAccessories.html