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Many PDAs are not suitable for modification or do not require it; the newest devices include advanced high-capacity batteries, whilst some devices cannot be dismantled without permanent damage.
The Palm [[Tungsten T3]] comescame with a built -in 900 [[Ampere-hour|mAh]] rechargeable [[Lithium ion battery]]. The [[Tungsten Handheld|T1]] and [[Tungsten Handheld|T2]] also used a 900mAh900 mAh battery, but because of the upgraded Palm Tungsten T3 processor the battery life is significantly reduced. The modest battery life is the largest criticism of the [[Tungsten T3]] compared to other Palm models. One of the most popular handhelds of all time, the Palm [[Tungsten T3]] is a typical candidate for battery modification.
The [[Tungsten T5]] however, includesincluded a much newer battery and is therefore a much less likely candidate for replacement, at least not yet. Much fuss has been made over the issue of the [[iPod|iPod's]] built-in li-ion battery and the fact that it is not designed to be [[IPod#Non-replaceable batteries|replaceable]]. Some have similar concerns over their handhelds' batteries and decide to try and remedy the problem themselves, just as was done on the iPod before Apple started offering extended warranties: in fact, [[Apple Computer|Apple]] [[iPod]] replacement batteries have become somewhat of a favourite for use as external replacements/additions.
===Replacing the internal battery===
A popular method discussed extensively on the brighthand.com and spug.net for modification have involved opening the case and removing the original 900mAh battery and replacing it with various higher -capacity batteries, or simply replacing it because of age (a replacement battery costs a small fraction of the manufacturer's battery-replacement charge).
Several people have successfully documented replacing the built -in [[Lithium ion battery]] with a higher-capacity battery, increasing time the T3 can be used without charging. {{Fact|date=December 2007}}. Batteries of 1100mAh are available that fit just fine. However, disassembling the case is complicated by 5 small metal tabs, not mentioned by most online instruction pages: two on each side, and one on the back just above the docking connector, which must be released as one of the first disassembly steps (for example, by inserting a very thin shim and pushing it gently down, while pulling the bottom panel down enough to clear it).
The biggest problem when upgrading the T3 battery to even higher capacity, however, is that there is limited space within the handheld shell for a larger battery. Hence, modification typically requires some crushing of the replacement battery to make it fit and/or irreversible modification to the internal components of the shell (for example the stylus holder). Another problem is that Lithium-Ion batteries require a regulator circuit to regulate battery charge preventing damage, and so replacement batteries either require a built-in one or a grafted regulator circuit added.
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