SpySpot Extended Slim Battery for GPS Trackers with Magnetic Mount Case and Battery Charger - Works with GL 200, GL 300, GL300W, GL-300MA, GL300MG, GL320MA

Heavy duty case with an extremely strong magnet. Ive only had it for a month so I cant say if the batteries are up to par or not but so far so good. Only issue is that its a tight squeeze for the GL300 almost too tight to where it wouldn't fit.

love this box its a very tigh fit with the tracker unit installed but expected that work great strong magnet which i like

I am a PI that has been putting on GPS units for many years. Was an early adopter. I decided to try Spy Spot out for their alleged 6 month extended battery to go with the STI300MA . The first one I received lasted about 3 weeks and I sent it back thinking a fluke. Had to go out, at midnight pull the unit and wait for the replacement batter. It finally came, charged it and went back and reinstalled on target vehicle. Well, this one is showing the same symptoms, and it is basically about as good as the regular extender sold by others and lasts about a month....not 6 months.So, they not only ripped me off for $179, but I have had to do risky exposures in getting this unit off and on a Land Rover (if you have ever tried that, you know what I talking about with their full underbody skid plates.I also had their case fall off a vehicle...it is a crappy magnet and design. Luckily, I actually found the whole unit on the shoulder of a road as it was transmitting yet.So, if you are a professional, this set up is not for you, as your reputation is on the line and you do way more work than you need to do. I am going back to my regular source and I should have known better...."If it sounds too good to be true......" yep.And as a side note to the Seller Spy Spot...stop putting your name on the black waterproof pelican style case!!! What kind of advertising are you going to get from a supposedly "hidden" black box under a car.Just what we need...another trail back to an investigator. I get the feeling you guys are not PI's nor have ever been out in the field.

Doesn’t last as long as it claims!

Good set up I have been using it for 3 weeks and its still 86%

Works like a charm. Very strong magnet. Everything fits quite tightly yet still fits. Perfect for its purpose.

WORKS LIKE A CHARM. ULTRA HEAVY MAGNET. WONT BUDGE.

You will need a USB type A to type C cable to connect the battery. But the case is not big enough.