Subject: [Shop-talk] Rebuilding a Battery Pack vs Buying New Generic

From: Jim Stone <[email-masked]>
Date: Tue, 24 Jun 2025 14:30:32 -0400

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I have an old Bosch 24v miter saw that I would like to be able to =
continue using for quick, non critical cuts.  The only problem is that =
the NiCad batteries won=E2=80=99t hold a charge long enough to be =
useful. And, I don=E2=80=99t think there is a way to utilize other, e.g. =
Milwaukee M18, batteries in a 24v system.  Besides, there don=E2=80=99t =
appear to be any adaptors available.

So, that leaves me with two choices: rebuild my current batteries or buy =
new ones on Amazon.  I=E2=80=99ve taken one of the battery packs apart =
and can see that it just uses standard Sub C 1.2v batteries - 20 of =
them!  I=E2=80=99ve never rebuilt battery packs but it looks pretty =
straight forward; just time consuming.  20 Sub C batteries would run me =
about $40-50.  (Having it done professionally looks to cost at least =
twice that.)  Or, I could just buy a Chinese-made replacement pack for =
just a few bucks more.  =
(https://www.amazon.com/Exmate-Replacement-Battery-Compatible-BH-2424/dp/B=
073Z9QHXS/ref=3Dsr_1_17). =20

I=E2=80=99m sure the replacement batteries are also made in China, but =
is there any reason to assume that rebuilding the packs myself will =
result in a better, longer lasting battery?  Any advice from those who =
have done this before will be much appreciated.

Thanks,
Jim=

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"overflow-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;">I have an old =
Bosch 24v miter saw that I would like to be able to continue using for =
quick, non critical cuts. &nbsp;The only problem is that the NiCad =
batteries won=E2=80=99t hold a charge long enough to be useful. And, I =
don=E2=80=99t think there is a way to utilize other, e.g. Milwaukee M18, =
batteries in a 24v system. &nbsp;Besides, there don=E2=80=99t appear to =
be any adaptors available.<div><br></div><div>So, that leaves me with =
two choices: rebuild my current batteries or buy new ones on Amazon. =
&nbsp;I=E2=80=99ve taken one of the battery packs apart and can see that =
it just uses standard Sub C 1.2v batteries - 20 of them! &nbsp;I=E2=80=99v=
e never rebuilt battery packs but it looks pretty straight forward; just =
time consuming. &nbsp;20 Sub C batteries would run me about $40-50. =
&nbsp;(Having it done professionally looks to cost at least twice that.) =
&nbsp;Or, I could just buy a Chinese-made replacement pack for just a =
few bucks more. &nbsp;(<a =
href=3D"https://www.amazon.com/Exmate-Replacement-Battery-Compatible-BH-24=
24/dp/B073Z9QHXS/ref=3Dsr_1_17">https://www.amazon.com/Exmate-Replacement-=
Battery-Compatible-BH-2424/dp/B073Z9QHXS/ref=3Dsr_1_17</a>). =
&nbsp;</div><div><br></div><div>I=E2=80=99m sure the replacement =
batteries are also made in China, but is there any reason to assume that =
rebuilding the packs myself will result in a better, longer lasting =
battery? &nbsp;Any advice from those who have done this before will be =
much =
appreciated.</div><div><br></div><div>Thanks,</div><div>Jim</div></body></=
html>=

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_______________________________________________

[email-masked]
Archive: http://www.team.net/pipermail/shop-talk http://autox.team.net/archive

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From: DAVID MASSEY <[email-masked]>
Date: Wed, 25 Jun 2025 11:48:16 +0000 (UTC)

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I used to have an old Makita drill that came with Ni-Cad a battery that eve=
ntually stopped being usable.=C2=A0 I bought a pair of lithium-based replac=
ement batteries.=C2=A0 On the surface they looked like a much better option=
 with double the capacity and they worked with existing drill and charger.=
=C2=A0 But (there's always a but, isn't there?) to make Lithium batteries w=
ork in a Ni-Cad environment required a electronic circuit and this circuit =
was always on and drew enough power to deplete the battery overnight.=C2=A0=
 I could charge them up in the evening and the next morning they would be c=
lose to dead.
But I see these are Nickel-Metal Hydride batteries.=C2=A0 Ni-MH batteries h=
ave characteristics more similar to Lithium - at least with regards to the =
charging regime (I've designed a battery charger for Ni-MH so I am familiar=
 with this) but are less susceptible to abuse.=C2=A0 I also see the bullet =
point about no self-discharge - which was my problem.=C2=A0 This is a $45 g=
amble (as it is with most no-name stuff from the Pacific rim) but YMMV.=C2=
=A0 This might be a good one.=C2=A0 Let us know.
BTW I bought a pair of Milwaukee 12V tools and never looked back.=C2=A0 I p=
itched all my Ni-Cad drills and recycled the batteries.
Dave=20

=20

    On Tuesday, June 24, 2025 at 01:36:47 PM CDT, Jim Stone <1789alpine@gma=
il.com> wrote:  =20

 I have an old Bosch 24v miter saw that I would like to be able to continue=
 using for quick, non critical cuts. =C2=A0The only problem is that the NiC=
ad batteries won=E2=80=99t hold a charge long enough to be useful. And, I d=
on=E2=80=99t think there is a way to utilize other, e.g. Milwaukee M18, bat=
teries in a 24v system. =C2=A0Besides, there don=E2=80=99t appear to be any=
 adaptors available.
So, that leaves me with two choices: rebuild my current batteries or buy ne=
w ones on Amazon. =C2=A0I=E2=80=99ve taken one of the battery packs apart a=
nd can see that it just uses standard Sub C 1.2v batteries - 20 of them! =
=C2=A0I=E2=80=99ve never rebuilt battery packs but it looks pretty straight=
 forward; just time consuming. =C2=A020 Sub C batteries would run me about =
$40-50. =C2=A0(Having it done professionally looks to cost at least twice t=
hat.) =C2=A0Or, I could just buy a Chinese-made replacement pack for just a=
 few bucks more. =C2=A0(https://www.amazon.com/Exmate-Replacement-Battery-C=
ompatible-BH-2424/dp/B073Z9QHXS/ref=3Dsr_1_17). =C2=A0
I=E2=80=99m sure the replacement batteries are also made in China, but is t=
here any reason to assume that rebuilding the packs myself will result in a=
 better, longer lasting battery? =C2=A0Any advice from those who have done =
this before will be much appreciated.
Thanks,Jim_______________________________________________

[email-masked]
Archive: http://www.team.net/pipermail/shop-talk http://autox.team.net/arch=
ive

[email-masked]

 =20
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<html><head></head><body><div class=3D"ydp5b697443yahoo-style-wrap" style=
=3D"font-family:Arial, Helvetica, sans-serif;font-size:16px;"><div><div dir=
=3D"ltr" data-setdir=3D"false">I used to have an old Makita drill that came=
 with Ni-Cad a battery that eventually stopped being usable.&nbsp; I bought=
 a pair of lithium-based replacement batteries.&nbsp; On the surface they l=
ooked like a much better option with double the capacity and they worked wi=
th existing drill and charger.&nbsp; But (there's always a but, isn't there=
?) to make Lithium batteries work in a Ni-Cad environment required a electr=
onic circuit and this circuit was always on and drew enough power to deplet=
e the battery overnight.&nbsp; I could charge them up in the evening and th=
e next morning they would be close to dead.</div><div dir=3D"ltr" data-setd=
ir=3D"false"><br></div><div dir=3D"ltr" data-setdir=3D"false">But I see the=
se are Nickel-Metal Hydride batteries.&nbsp; Ni-MH batteries have character=
istics more similar to Lithium - at least with regards to the charging regi=
me (I've designed a battery charger for Ni-MH so I am familiar with this) b=
ut are less susceptible to abuse.&nbsp; I also see the bullet point about n=
o self-discharge - which was my problem.&nbsp; This is a $45 gamble (as it =
is with most no-name stuff from the Pacific rim) but YMMV.&nbsp; This might=
 be a good one.&nbsp; Let us know.</div><div dir=3D"ltr" data-setdir=3D"fal=
se"><br></div><div dir=3D"ltr" data-setdir=3D"false">BTW I bought a pair of=
 Milwaukee 12V tools and never looked back.&nbsp; I pitched all my Ni-Cad d=
rills and recycled the batteries.</div><div><br></div><div class=3D"ydp5b69=
7443signature"><div style=3D"color: black; font-style: normal; font-size-ad=
just: none; font-weight: normal; font-stretch: normal; font-size: 12pt; lin=
e-height: normal; font-family: Arial, Helvetica, sans-serif;"><div style=3D=
"color: black; font-style: normal; font-size-adjust: none; font-weight: nor=
mal; font-stretch: normal; font-size: 12pt; line-height: normal; font-famil=
y: Arial, Helvetica, sans-serif;"><div><font size=3D"4">Dave <br></font></d=
iv><div><span style=3D"font-size:10.0pt;font-family:sans-serif;color:black;=
"><br></span></div><br></div></div></div></div>
        <div><br></div><div><br></div>
       =20
        </div><div id=3D"ydp39c7469ayahoo_quoted_1269154354" class=3D"ydp39=
c7469ayahoo_quoted"><div class=3D"ydp39c7469ayahoo-style-wrap" style=3D"fon=
t-family:Arial, Helvetica, sans-serif;font-size:16px;">
            <div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
               =20
                <div class=3D"ydp39c7469aquoted-text-header">
                        On Tuesday, June 24, 2025 at 01:36:47 PM CDT, Jim S=
tone &lt;[email-masked]&gt; wrote:
                    </div>
                </div><div style=3D"font-family:'Helvetica Neue', Helvetica=
, Arial, sans-serif;font-size:13px;color:#26282a;border-left: 1px solid #cc=
c;padding-left: 8px;margin: 0px 0px 0px 8px" class=3D"ydp39c7469ainline_rep=
ly_quote_container" data-split-quote-node=3D"true">
                <div><br></div><div><br></div>
                <div><div id=3D"ydp39c7469ayiv7389328937"><div>I have an ol=
d Bosch 24v miter saw that I would like to be able to continue using for qu=
ick, non critical cuts. &nbsp;The only problem is that the NiCad batteries =
won=E2=80=99t hold a charge long enough to be useful. And, I don=E2=80=99t =
think there is a way to utilize other, e.g. Milwaukee M18, batteries in a 2=
4v system. &nbsp;Besides, there don=E2=80=99t appear to be any adaptors ava=
ilable.<div><br></div><div>So, that leaves me with two choices: rebuild my =
current batteries or buy new ones on Amazon. &nbsp;I=E2=80=99ve taken one o=
f the battery packs apart and can see that it just uses standard Sub C 1.2v=
 batteries - 20 of them! &nbsp;I=E2=80=99ve never rebuilt battery packs but=
 it looks pretty straight forward; just time consuming. &nbsp;20 Sub C batt=
eries would run me about $40-50. &nbsp;(Having it done professionally looks=
 to cost at least twice that.) &nbsp;Or, I could just buy a Chinese-made re=
placement pack for just a few bucks more. &nbsp;(<a href=3D"https://www.ama=
zon.com/Exmate-Replacement-Battery-Compatible-BH-2424/dp/B073Z9QHXS/ref=3Ds=
r_1_17" rel=3D"nofollow" target=3D"_blank">https://www.amazon.com/Exmate-Re=
placement-Battery-Compatible-BH-2424/dp/B073Z9QHXS/ref=3Dsr_1_17</a>). &nbs=
p;</div><div><br></div><div>I=E2=80=99m sure the replacement batteries are =
also made in China, but is there any reason to assume that rebuilding the p=
acks myself will result in a better, longer lasting battery? &nbsp;Any advi=
ce from those who have done this before will be much appreciated.</div><div=
><br></div><div>Thanks,</div><div>Jim</div></div></div>____________________=
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