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1300Ah battery fully drains after 10-15 mins drilling into concrete post - Battery faulty???

Discussion in 'Building' started by LikeMyHome, 22 Jun 2020.

  1. LikeMyHome

    LikeMyHome

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    Dear all,

    I'm drilling concrete fence post with a cordless combi drill in hammer mode and a new fully charged 1300mA battery gets flat after 10-15 mins of drilling.

    The drill is Dewalt dcd776
    Battery is 18V, 1300mAh dcb185 dewalt battery.
    Both drill and battery are new (bought a few days ago from B&Q).

    Is this normal battery runtime for drilling into concrete with this battery or is it something abnormal here (maybe faulty battery despite that it's new)??

    I think 10-15 min into concrete even with 1300mAh sounds too little. Please let me know what you think?

    Thanks a lot!

    P.S.
    I have another ~3 years oldcordless combi (14.4V, 1500mAh) Workzone drill and that lasts longer (maybe ~20 minutes) when drilling into the same concrete posts, but for easier drilling (e.g. into brick) that used to last for a few hours of drilling (many weeks of standby time), so maybe 20 minutes ino concrete now cos the battry is old.
     
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  3. big-all

    big-all

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  4. ^woody^

    ^woody^

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    15 minutes drilling into a fence post? That's your problem right there.
     
  5. cdbe

    cdbe

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    Maybe you're hitting rebar.
     
  6. LikeMyHome

    LikeMyHome

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    Could be, but still doesn't answer my question about 1300mAh battery life time.
     
  7. kingandy2nd

    kingandy2nd

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    1.3amp battery is tiny! 10 -15mins of all drilling sounds like a good effort for it.
     
  8. LikeMyHome

    LikeMyHome

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    Again, maybe. I fist drill with 3mm drill bit - that takes most of the time - about 15-20 min per hole.
    Then use 4 and finally 6mm bits - those go thru quickly (like 1-2 mins or less).

    That still doesn't explain fast battery draining on the new drill - most reviews says the battery has a long run time and they're happy with performance.
     
  9. ^woody^

    ^woody^

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    Of course it does. 15 minutes pounding away in tough concrete and you have one of the smallest capacity batteries that is made.

    More than 5 minutes would be a bonus with that battery
     
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  11. LikeMyHome

    LikeMyHome

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    You serious?? My other drill Workzone codless combi has 14.4V, 1500mAh battery and I've just finished the hole in the post with it - this took another ~10 mins and drained the 1500mAh battery by only 20% (so 80% charge still left). So itsn' 1.3Ahx18V running for ~10-15 mins into concrete too short?? 10-15mins is overall time including pauses+bit cooling, real work time is under 10 mins.
     
  12. Notch7

    Notch7

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    they are probably happy with the performance in wood, not in hard concrete with steel reinforcing.

    cordless screwdrivers are brilliant -they have bags of torque and can go for hours putting in screws
    cordless drills:much more limited -drilling large holes or in hard materials will kill em quickly

    a 1.3Ah battery is a diy size, most pro batteries are 3, 4 or even 5ah these days

    for your job, I would use a mains drill unless you have no power nearby
     
  13. LikeMyHome

    LikeMyHome

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    So conclusion is that for concrete drilling I need much more powerful battery, which would cost nearly the same as the whole drill+charge+1.3Ah battery. Is it really worth investing/wasting £150 into Dewalt combi drill for occasional concrete drilling if I can buy Makita DHR202z(Hammer+SDS) with 3Ah battery + charger for under £200??
     
  14. ^woody^

    ^woody^

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    No you dont' need a more powerful battery, you need a different drill that will drill the hole in 15 seconds not 15 minutes. An SDS.

    Or you could try a better bit.
     
  15. LikeMyHome

    LikeMyHome

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    I really want cordless as I'm occasional DIYer so I don't need a serious corded beast, which is much heavier (typically 4-6kg), need long extension (~15m or more) to drill outside like back garden. So flexibility of having cordless is more important for me.
     
  16. Notch7

    Notch7

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    the dewalt model is available with 2 x 4ah batts for £160incl

    https://www.amazon.co.uk/DEWALT-DCD...+dcd776&qid=1592838695&sr=8-2&tag=googhydr-21
     
  17. HERTS P&D

    HERTS P&D

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    I remember those days.;)

    :ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO:

    Andy
     
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