I got home and installed the battery as fast as I could.  My son was with my wife at “My Gym” so I had about 45 minutes to get this battery in.

Installation should take about 15 minutes, it took me about 30 minutes, mainly because I double checked everything and took pictures along the way to make sure I didn’t forget anything.  It was dark.

It’s really quite easy.  The battery I installed was a Bosch PremiumPower.  (about $75 USD)

This summer when I have time, I’ll probably install an Optima Red Top and keep this guy as a backup.

Here is what it says on the top:

• CCA @ 0^F : 630
• CA @ 32^F : 785
• RC Mins @ 25 Amps : 90
• Part Number: 86-630B
• Group Size: 86

Uninstallation of Old Battery:

Click open the battery’s negative (black) cover to access the post and nut.  Loosen the negative battery cable nut.

I used a 10mm socket wrench for this.  Pull it off the post and set aside.  Make sure it doesn’t touch anything.

Click open the battery’s positve (red) cover.  Loosen the positive cable nut.  Work it off the post and set aside.  Again make sure this doesn’t touch anything.  Even though it’s not connected to anything it’s just a good habit to keep when working with electrical stuff.

Remove battery vent hose.  It slides right off.

Remove the battery upper box.  Press the locking tabs inward and lift up.  It might be easier to do one side and angle it up to release the other tab.  The tab closest to the fender is a little tight to get your hand in to push the tab.  Angle it out.

Disengage the battery strap.

I used a 13mm socket wrench for this.

Loosen and take off the nut.  Slide strap end up.  This will create the slack you need to take the strap off the other side of the battery’s lower tray’s restraint.  Also this exposes the cleat that holds the base of the battery down.
The cleat fits over a groove that is in the battery and wedges it down.  Remove the cleat by pulling it straight up along the bolt that it sits on.

Here is a picture of the cleat.

You must remove the cleat before you remove the battery.  The 2 pictures above where shot just to show the cleat.  I had already taken the battery out so you can see how it wedges the battery down. Just imagine the battery sitting in the tray. You’ll see in a couple of photos below with the new battery installed.

Remove the battery.

Installation of New Battery:

Note the groove toward the bottom backside of the battery.

Place new battery into lower half of battery tray.  Notice there is no cleat yet.  Make sure, if you are installing a battery intended for a Hummer H3, the groove on the back of the battery is closest to the firewall of the engine compartment.  This is where the safety cleat will clamp down on.

Place safety cleat over bolt and slide down into position.

Place battery strap on the front side, hook into position.

Place end of battery strap over bolt on top of the safety cleat.

Install the retainer nut.  Use that 13mm socket and tighten down.  If the battery you are installing sits a little shorter, wedge it with some material that can take some heat, it gets hot in there.

Install the battery upper box and make sure the tabs click.

Make sure your Positive and Negative battery cables are free from corrosion.  Use a wire brush to clean.  Install the positive (red) cable.  Use the 10mm socket to tighten nut.  Install the Negative cable, tighten the nut.  Close the plastic covers.

Connect the battery vent hose.

All done.  Start her up!

Hey, Leave a comment.  Let me know if you stopped by!  Thanks!

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It doesn’t help that recently my 2 year old has taken a liking to playing in the H3.  He likes turning on the lights, rolling down the windows, opening and closing the sunroof, turning on and off the fan for a good 10 to 15 minutes almost every time we get home and pull into the driveway.  That’s another story.

I threw a question out to my Hummer Friends at HummerXClub.com for their suggestions on what is the best battery on the market for an H3.

“I have a 2006 Hummer H3. What’s the best battery for the rig without too much fuss of installing?”

Many came back with great pictures of their installs.  The overwhelming response was the Optima brand, more specifically, the Optima Red Top.  Well as time passed by my battery grew weaker and weaker.  I still hadn’t pulled the trigger as to which battery I’d get.  In the long run the Optima Red Top would work the best however there were some immediate drawbacks.

Optima Red Top

CONS:

• I’d have to modify the existing battery enclosure in-order to for the optima to fit.  It’s a little taller than the OEM sized battery.
• Possibility, based on current reviews of the battery, that it potentially could be hit or miss on getting one that was DOA or with non-working cells.
• Price.  The Optimas tend to be a little more pricey than your everyday battery.

PROS:

• Well liked and a good name in the wheeling community.
• Powerful battery used in cold weather.
• Sealed and maintenance free and lasts a long time. (As long as you get a problem-free one…)

My dilemma?  How much time would I have to physically replace the battery given the variable of my two year old son?  In a perfect world, a couple of hours and a beer; in the real world, 3.5 minutes and a red-bull.  I needed to find something in the middle.

Let’s jump to the end of the month, December 28th.  The original battery lost it’s mojo.  Not bad, I guess, it lasted a good 3.5 years 62K miles.  I walked out to the parking lot after work, turned the key and there was silence, a silence similar to what I would give in place of vermouth to my dry vodka martini.

I was the last one out to lock up that evening, but luckily my friend and co-worker, Finlay G., was in the area to come back and help jump start it.  He followed me over to the Sear Auto Center, given the lack of time I thought, “Die Hard, that will work.”  Much to my surprise Die Hard/Sears don’t make a battery for the size the H3 needs.  Bummer.  The guy at Sears pointed me over to PepBoys a few miles away.  Jump start and I was on my way.

PepBoys – for some reason the same smell of tires and stale car fresheners has stayed the same over the years.  It triggered memories of when I was a toddler going up and down the aisles with my dad looking for parts for either the Pinto, the Corvair, or the Volaré.  Classic.  I went to the back counter and asked for a battery for the H3, they had one.  And when I say they had one, I mean they had one. One brand and only one in stock.  ”I’ll take it.”

Bosch Premium Plus

CONS:

• I hadn’t done any research on this battery.

PROS:

• I’ll fit.
• I can install with minimal time and effort.

Read the Installation Here.

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