Beat me to the punch ;)
Beat me to the punch ;)
One benefit of lead acid is it can be used for jumpstarting a car. Do we know if lithium ion batteries can jump-start a car without destroying/damaging the battery?
I'd like to also have a portable power solution that I can use to start the car if its battery is dead. It would be awesome if there's something that would fullfill all my needs.
For backpacking you of course wouldn't want anything like this, though I do sometimes carry a small USB power pack if I want to keep a phone charged.
I also camp in an a-frame camper, often off the grid. The camper has an on-board battery, but I'm usually also powering a laptop and astronomy equipment.
One of the pictured units would probably work for me, but for a cheaper solution I use a deep cycle battery. It's in a plastic battery box (like you would have on a camper for for a trolling motor), where I've added fused 12V power ports (power poles and auto DC sockets) and a volt meter. It's heavy, but lasts a long time.
I recharge both the camper and battery box using a 100W solar panel and charge controller. I just hook it up to whatever needs charging for the day and leave it out.
I bought one of these from Costco for $79 for one of our cars and it turned out to be so handy, we bought one for every car. Works great. I dunno how many jumps we get per charge, but I'm guessing 6.
We have old cars and if the kids leave a door ajar or something, we need to jump.
Wow, astronomy equipment! Would love to hear more about what you're powering. You have the most unique use case for a battery of all of us in the conversation so far :)
I had one of those. I tried jumping my car a few time with it: never worked. I wonder if I got a fualty one or my motor just doesn't like to turn over easily.
Actually these days I don't do as much... I was doing astrophotography, so I needed to power an equatorial mount and laptop, and dew heaters if needed.
These days though I'm doing more visual astronomy. My thinking is that I shouldn't spend time outside staring at a computer screen when I could be looking up!
There are a few tricks you may want to try to see if it's up to the task. If your battery is really dead, often I find that it takes more than a minute for enough energy to transfer to the dead battery to crank the engine. Also making sure the clamps have sufficient surface contact to support a decent amount of current. The more surface contact you can make with the clamps, the less patience you'll need. But regardless you will need *some patience* . Only after you've waited a while would I try the ignition switch.