Why I Keep a Schumacher Rugged Lithium Jump Starter After My E70 Tow Hitch Install Left Me Stranded

If you found this because you searched “Michael Schumacher car”, let me save you the detour: this isn't about the F1 driver. But if you're here because the name Schumacher means battery chargers to you, or because an E70 tow hitch install is sitting in your bay, this is for you. I'm the guy who keeps a Schumacher rugged lithium jump starter within arm's reach, and the reason is a mistake I almost made twice.

Here's my opinion, and I'm not going to soften it: most “emergency” rescue situations are actually checklist failures. The five minutes you skip before a job can turn into five days of fixing. I have the receipts, the credit card statement, and the memory of a very long weekend to prove it.

The day a 2-hour install turned into a weekend project

It was late 2022—September, I think, though I might be misremembering the exact month—when I decided to install a tow hitch on my BMW E70. The plan was simple: two hours, one afternoon. I had the hitch, a torque wrench, and a hand spinning tool for the bolts that sit too close to the subframe for a regular ratchet. What I didn't have was a battery plan.

Here's where it fell apart. I needed to raise the rear suspension to get clearance, so I opened the driver's door, hit the ride-height button... nothing. The battery was dead. It wasn't old, and the alternator was fine. The car just sat with the hatch open, my work light plugged in, and the radio playing for two hours while I tried to work bolt number four loose. The E70's electrical system wasn't designed for that kind of slow drain, and I wasn't paying attention. (Fun fact: that hand spinning tool wasn't even mine. I'd borrowed it from a buddy's kit. Ironic, since my own socket set was fifteen feet away.)

Everything I'd read about jump starters said they were for emergencies. In practice, I found the real value is better described as insurance: when you have one, you stop fearing the moment your battery gives up. That night, I didn't have one. The car sat until morning, and a same-day delivery of a Schumacher rugged lithium jump starter cost me more than the unit itself would have if I'd bought it earlier. The overnight charger, the delivery fee, and the wasted time added up to maybe $230—no, $180, I'm mixing it up with the diagnostic rental—either way, it was stupid money. Let me rephrase: I paid more to be stranded than I would have paid to be prepared.

This wasn't my first time making that mistake. In 2017, I did the same thing on a customer's Toyota Tundra and killed the battery while programming a module. It cost me a battery, a jump, and a discount on the invoice. I forgot that lesson by 2022, and the E70 charged me again. The common thread wasn't bad equipment. It was missing a pre-flight check.

Why the Schumacher rugged lithium jump starter stays in my trunk

I'm not going to pretend I side-by-side tested every jump starter on the market. I chose Schumacher for the same reason I choose most shop tools: reputation, documentation, and protection features. According to Schumacher's product documentation on schumacherelectric.com, the rugged lithium series includes reverse-polarity protection, over-temperature protection, and a built-in LED work light. That last one isn't marketed loudly, but it's the feature I use most when I'm working under a car at dusk.

The unit is compact—about the size of a thick paperback—so it fits in the E70's side compartment without eating cargo space. It has enough power to start my 3.0-liter X5, and I've also used it on a customer's V8 Range Rover without drama. That doesn't mean it starts every vehicle on earth, and I'm not saying that. What I am saying: for the vehicles that fit its spec range, it does the job. Check the manual, match it to your vehicle, and keep the clamps clean.

The part that changed my behavior isn't the product, though. It's the mindset. I don't carry a jump starter because I expect a battery to die every week. I carry it because the one day you don't have it is the day the E70 decides to show a parasitic drain you didn't ask for. The cost of carrying it is small. The cost of not carrying it is a tow truck. As of May 2025, comparable Schumacher rugged lithium units are roughly in the $120–$200 range based on major retailer listings—verify current pricing before you order.

Rent before you buy: the OBDeleven lesson

The same logic applies to diagnostic tools. About a month after the hitch install, I had a parking sensor fault that needed a module coding session. I didn't need a $400 tool to change one setting, so I did a quick search for where to rent OBDeleven diagnostic tool. I found a rental for a fraction of the purchase price, shipped to my door, and returned it after the job. It did what I needed, and I learned something about my own spending habits.

Renting isn't always the right move. If you're coding cars every week, buy the tool and amortize it across jobs. But if you're using something once, renting is the preventive move for your wallet. That's the same principle as the jump starter: verify the need before you commit, and don't let a one-time problem turn into a new shelf queen.

Objections I hear from other mechanics

“I don't need a jump starter because I have a charger in the shop.” That was me too. The charger was in the shop. The car was in my driveway. Different place, different tools. The portable unit goes where the dead battery is, not where the electricity is.

“Roadside assistance covers me.” Roadside assistance covers you after 45 minutes and a phone call. I've used it twice, and both times a portable jump starter would have fixed the problem in under two minutes. The convenience isn't just about money; it's about momentum. When I'm in the middle of a job, momentum is worth more than the hourly rate.

“Is this even about Michael Schumacher's car?” No. It's about a different Schumacher—the one that makes rugged lithium jump starters, chargers, and maintainers. If you're looking for an F1 car, you're in the wrong post, but you're not far from the right habit: every good driver, on track or in a driveway, checks the systems before they need them.

“A checklist is overkill for a simple job.” Maybe. But the first time you skip it and spend a weekend staring at a half-installed hitch, you'll understand. I'd rather be the mechanic with a boring checklist than the one ordering a same-day delivery on Sunday.

The bottom line: check first, rescue rarely

I keep a small checklist in the toolbox now:

• Disconnect the battery before major electrical work.
• Charge the spare battery or have a jump starter where I can grab it.
• Verify the diagnostic tool is the right one for the job, or rent it before buying.
• Give the bolts and the battery state one last visual check before starting.

It's not a complex system. It's just the difference between being the guy who solves problems and the guy who creates them. If a Schumacher rugged lithium jump starter is in your budget, or if you're still trying to decide whether to rent an OBDeleven for your next coding session, ask yourself one question: what does the five-minute check cost compared to the five-day fix?

Five minutes of prevention beats five days of correction. Every time.