Charge pack

Charge pack
Release	25 January 2016 (Update)
Members	Yes
Quest item	No
Properties
Tradeable	No
Bankable	No
Equipable	No
Stackable	No
Disassembly	No
Destroy	You cannot destroy this item until you complete the Invention tutorial.
Values
Value	1 coin
Alchemy	Not alchemisable
On death	Always kept
Weight	0.01 kg
Examine
Added to your tool belt, provides power to all equipped Invention devices.
FAQ • doc

The charge pack acts as a universal battery for augmented items. It is the first invention the player makes in the Invention Tutorial and is added to the tool belt. It therefore cannot be dropped and is kept on death even if the player is skulled and dies with it.

It is half-charged at 100,000 when players create it. More charge can be added by using a Divine charge.

Even if the Charge pack depletes, augmented equipment still retains its gizmos and experience and can still be equipped. However, augmented items no longer offer any bonuses without charges, get tier 1 stats and all gizmos lose their abilities. Augmented items do not level up without charges.

Higher Invention levels allow players to research higher maximum charges.

Level	Unlock	Maximum charge
1	Charge pack	200,000
22	Maximum charge improvement 1	250,000
40	Maximum charge improvement 2	300,000
64	Maximum charge improvement 3	350,000
87	Maximum charge improvement 4	400,000
95	Maximum charge improvement 5	500,000

Charge drain

This article has a calculator here. Calculators determine experience and costs based on real-time prices from the Grand Exchange Market Watch.

Inspecting an augmented item

Augmented items (whether or not they have gizmos) no longer use the equipment degradation system, and instead drain charge from the central charge pool each second of combat. This applies to all augmented items including those that did not degrade before augmentation. This rate depends on the item that has been augmented, and can be reduced by researching charge drain reduction.

The current drain rate for an augmented item is displayed in the Check right-click option. This shows both the drain rate of the item checked and the total drain rate of all worn augmented items.

During combat with augmented items (or skilling with a relevant augmented tool), charge is drained similarly to how non-augmented degradable items degrade. Each hit dealt or taken (ability or otherwise), or each skilling action, 10 ticks (6 seconds) of charges are drained at once, with a 10-tick cooldown before more can be drained. This means that charges can be wasted easily: for example, ten ticks of charges are used to kill an imp, even if it is killed in one tick.

On death, any augmented equipment which is not protected will drain two hours worth of drain rate when it is recovered; e.g. If a 1 charge/second drain weapon is not protected, it drains 7200 charges on recovery.

Drain reduction

The charge drain rate of an augmented item depends primarily on the item's tier and slot, but it is reduced by several factors:

• Charge drain reduction researched reduces charge drain of all items
• Items level 5 and higher drain charge 10% slower
• Items with the efficient perk drain charge 6% per rank slower
• The Invention cape (or its trimmed variant) provides a 2% drain reduction when worn.

Charge drain rate is displayed to two decimal places, but is actually calculated to at least 3 or 4 and rounded down when displayed.

Formula

The charges drained per second $D$ follows:

$D={\frac {T-60}{8.0}}\times S\times R\times L\times E\times P$

Where:

• $T$ is the applied tier of a tier $t$ item. Tier 70 and above items will use their equipment tier for the calculation; any item below tier 70 will use 67.

$T={\begin{cases}67&{\text{if }}t<70\\t&{\text{if }}t\geq 70\\\end{cases}}$

• $S$ is the slot modifier:

$S={\begin{cases}1.50&{\text{2-handed}}\\1.00&{\text{1-handed main-hand}}\\1.00&{\text{body- and leg- slot}}\\0.50&{\text{off-hand}}\\0.25&{\text{tools}}\end{cases}}$

• $R$ is the charge drain reduction modifier for current research:

Reduction	Level	$R$
None	1	1.00
1	34	0.99
2	49	0.97
3	64	0.95
4	69	0.93
5	78	0.91
6	83	0.88
7	91	0.86
8	95	0.83
9	105	0.80

• $L$ is the Equipment level modifier from the item's level $I$

$L={\begin{cases}1&{\text{if }}I<5\\0.9&{\text{if }}5\leq I<14\\0.875&{\text{if }}14\leq I<18\\0.85&{\text{if }}18\leq I\end{cases}}$

• $E$ is the Efficient/Enhanced Efficient modifier. For a rank $r$ efficient perk (if multiple gizmos contain efficient on a single item, only use the highest ranked)

$E={\begin{cases}1-(0.06\times r)&{\text{Efficient}}\\1-(0.09\times r)&{\text{Enhanced Efficient}}\\1&{\text{No efficient perk}}\end{cases}}$

• $P$ is the invention cape (trimmed) perk

$P={\begin{cases}0.98&{\text{When worn}}\\1&{\text{When not worn}}\end{cases}}$